Alternatives to Kopano
Compare Kopano alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Kopano in 2026. Compare features, ratings, user reviews, pricing, and more from Kopano competitors and alternatives in order to make an informed decision for your business.
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1
PoliteMail
PoliteMail Software
Gain Outlook email intelligence, not overload. To measure and improve internal Outlook email broadcasts to employees, corporate communicators send PoliteMail. PoliteMail Software adds email analytics, responsive HTML design, and list management tools to the enterprise email program you already know how to use, Microsoft Outlook and Exchange. PoliteMail makes it easy to create impressive, highly readable corporate communications, with advanced analytics to enable you to discover the email employees actually read, with key metrics to help you improve results over time. PoliteMail offers the ability to not only compose, design and send – but also provides meaningful metrics that will help you to determine the best strategy for all your internal comms needs and all without leaving the familiar interface of Outlook! -
2
Courier
Double Precision, Inc.
The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be enabled or disabled at will. The Courier mail server now implements basic web-based calendaring and scheduling services integrated in the webmail module. Advanced groupware calendaring services will follow soon. The Courier mail server's source code should compile on most POSIX-based operating systems based on Linux, and BSD-derived kernels. The Courier mail server should also compile on Solaris and AIX, with some help from Sun's or IBM's freeware add-on tools for their respective operating systems. The Courier mail server evolved out of several related projects, that merged together (more on that later). The Courier mail server implements SMTP extensions for mailing list management.Starting Price: Free -
3
Horde
Horde
Horde is the most flexible groupware on the planet, and that makes it the perfect platform on which to build your business productivity software. Horde connects to (and officially supports) more backends (all the leading SQL, LDAP, IMAP, Sieve, SMTP, cache platforms available today) than any other open source groupware system. This means you can continue to use your existing userbase and your users do not have to remember any additional passwords. Horde's feature set rivals the largest enterprise email systems. We have an incredible feature set that compares favorably against any competition in our primary apps (mail, calendar, address book), and even more in our secondary apps (time tracking, wiki, ticketing, and more).Starting Price: Free -
4
FTGate
FTGate
FTGate is an award winning Email, Groupware and Productivity server. With low installation and operating costs, secure communications and simple administration, FTGate offers our customers a powerful and cost-effective alternative to Microsoft Exchange. FTGate users benefit from extensive mail client support across multiple platforms, enabling users to choose their favourite mail client, and the powerful FTGate Web Mail client provides comprehensive email, groupware and productivity tools in an intuitive browser interface. Low hardware requirements combined with simple and quick Administration makes FTGate the best solution for your email, groupware and productivity needs. The workplace is now one in which everyone has their favourite device, so FTGate allows your users to choose their preferred devices, both mobile and desktop, and which platforms they work on.Starting Price: $2.78 per user per month -
5
mailcow
mailcow
mailcow: dockerized is an open source groupware/email suite based on Docker. mailcow relies on many well known and long used components, which in combination result in an all around carefree email server. Each container represents a single application, connected in a bridged network.Starting Price: Free -
6
Afterlogic Aurora
AfterLogic
Groupware system for businesses and providers, backed with mobile apps. Your private cloud combining groupware, file storage and email in a single, unified environment. Clean and modern interface. Can work with your existing mail server or use its own for the complete solution. iOS/Android apps for Email and Files let your users just type their email/password and never deal with mail server settings or blocked IMAP/SMTP ports. Can be integrated with LDAP authentication or LDAP address book, along with OAuth 2.0 authentication and resources, like Google Drive or Dropbox.Starting Price: $99.00/one-time -
7
Mailu
Mailu
Mailu is a simple yet full-featured mail server as a set of Docker images. It is free software (both as in free beer & as in free speech), open to suggestions and external contributions. The project aims at providing people with an easily setup, easily maintained and full-featured mail server while not shipping proprietary software nor unrelated features often found in popular groupware. Main features include: Standard email server, IMAP and IMAP+, SMTP and Submission with autoconfiguration profiles for clients Advanced email features, aliases, domain aliases, custom routing Web access, multiple Webmails and administration interface User features, aliases, auto-reply, auto-forward, fetched accounts Admin features, global admins, announcements, per-domain delegation, quotas Security, enforced TLS, DANE, MTA-STS, Letsencrypt!, outgoing DKIM, anti-virus scanner, Snuffleupagus, block malicious attachments Antispam, auto-learn, greylisting, DMARC& SPF, anti-spoofingStarting Price: Free -
8
Horde Groupware
Horde Groupware
Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks, notes, files, and bookmarks with the standards compliant components from the Horde Project. Horde Groupware bundles the separately available applications Kronolith, Turba, Nag Mnemo, Gollem, and Trean. It can be extended with any of the released Horde applications or the Horde modules that are still in development, like a bookmark manager, or a file manager. Dynamic, basic and mobile interfaces. Public and shared resources (calendars, address books, tasklists and notepads). Translated into 41 languages including right-to-left scripts and full unicode support. Customizable portal screen including applets for weather, quotes, etc. Import and export of groupware data from other applications. User preferences with global default values. -
9
Citadel
Citadel
Email, collaboration, groupware, and content management - up and running in minutes, on your own hardware, or in the cloud. Citadel is easy, versatile, and powerful, thanks to its exclusive room-based architecture. No other platform seamlessly combines so many different features using this familiar and consistent metaphor. Citadel is 100% open source software using the GNU General Public License. It's not a crippled, cut-down version of some expensive "enterprise" edition. The software you download here is the very best available, and it's all free software.Starting Price: Free -
10
GroupOffice
Intermesh
Group-Office is an open-source groupware and CRM platform. Collaborate with integrated file sharing, video conferencing, E-mail, calendar and contact management, project and time tracking, quoting and invoicing, support ticketing and collaborative document editing. By combining all these tools in a single platform, Group-Office eliminates the need for multiple separate systems and streamlines your workflow. Group-Office is easily extensible with custom modules, allowing you to tailor the platform to your specific needs.Starting Price: € 12/month/user -
11
SOGo
SOGo
SOGo is a fully supported and trusted groupware server with a focus on scalability and open standards. SOGo is released under the GNU GPL/LGPL v2 and above. SOGo provides a rich AJAX-based Web interface and supports multiple native clients through the use of standard protocols such as CalDAV, CardDAV and GroupDAV, as well as Microsoft ActiveSync. SOGo is the missing component of your infrastructure; it sits in the middle of your servers to offer your users a uniform and complete interface to access their information. It has been deployed in production environments where thousands of users are involved. -
12
MailEnable
MailEnable
MailEnable provides an end to end solution for providing secure email and collaboration services. A recent independent survey reports MailEnable as the most popular Windows Mail Server Platform in the world. Whether you are a hosting company providing email services to thousands of end users or a small business with a single domain, MailEnable provides a solution that will impress your mail users. MailEnable provides Windows Mail Server software with features comparable to Microsoft Exchange. It provides powerful messaging services like Exchange ActiveSync, IMAP, SMTP, POP3 and collaboration tools such as calendaring (CalDAV), contacts (CardDAV), tasks and notes.Starting Price: $349 -
13
Kerio Connect
Aurea
Secure, enterprise-style email, calendar & collaboration without the high cost. Kerio Connect delivers all the features and functionality for collaboration and messaging solution without the complexity and high price tag of other systems. Email is integrated with shared calendars and scheduling, contacts management, tasks, notes, shared and public folders, and instant messaging. Synchronize messages by direct push to your choice of mobile device via Microsoft ActiveSync. Instant Messaging is XMPP-compatible and can be used from various 3rd party chat/IM applications on desktop and mobile phones. You can install Kerio Connect in 10 minutes and users can be up and running in just 10 minutes more. Kerio Connect can be deployed on-premises or in partner-hosted cloud environments. Deploy for users on Mac, Windows, or Linux; plus full support for Outlook (Windows and Mac) and many other IMAP or POP compliant email clients.Starting Price: $36.50 -
14
MailSite Fusion
Rockliffe Systems
MailSite Fusion is a Windows email, calendar and contact server with over-the-air push to all types of smartphones, Full native Outlook sync, a sophisticated AJAX web client and a calendar and contact sharing server, which can synchronize and publish to many other clients. MailSite has been voted in the top 3 mail server products by readers of Windows IT Pro Magazine 3 years running. Your email services are critical to your organization. So you need to be sure that you select a quality product, from a company with a proven track record in communication software. So, why this mail server? Because Rockliffe understands your concerns, we have been specializing in developing and refining our email server and email security software for business and service providers since 1995. Built from the ground up to be fast, stable and secure, MailSite Fusion is ready to meet the needs and requirements that matter to you most.Starting Price: $90 per year -
15
The Very Good Email Company
The Very Good Email Company
Your email in safe hands! The Very Good Email Company have built a range of services around its core email filtering services: filtering, hosting, groupware tools, archiving and fax to email solutions are available. Gateway: weapons-grade anti-virus and anti-spam filtering before it hits your, or your customers’ network! MailCore Pro: email hosting and office collaboration service: providing email, shared calendars, contacts, files and notes. Includes anti-virus and anti-spam filtering as standard. Zimbra: all the benefits of the Zimbra enterprise-class email, calendar and collaboration solution, with our spam and virus filtering as standard. Now with a huge 50GB of storage per mailbox! Messagebunker: a simple, secure, easy to set up and use in-the-cloud email archiving and discovery platform that won’t break the bank. FREE Trial! -
16
SmarterMail
SmarterTools
SmarterMail is the ideal Microsoft Exchange alternative. It’s the only business email server on the market that offers native support for Exchange protocols: MAPI, EWS, and EAS, without requiring any additional software or plug-ins for Microsoft Outlook or other desktop or mobile clients. It delivers all the features of Exchange at a fraction of the cost. SmarterMail also includes audio/video group chat and Online Meetings for team collaboration at no extra charge. Its newest feature, the SmarterMail Marketplace, enables seamless integration with platforms like OnlyOffice, Collabora, and AI tools such as OpenAI’s ChatGPT. Available for both Windows and Linux, SmarterMail has lower hardware requirements, superior stability, and reduced maintenance costs. It’s the perfect solution for businesses of any size or industry seeking Exchange-level functionality, without the high costs.Starting Price: $500.00/one-time -
17
Scedule
Scedule
Stop wasting your time figuring out when all are available. Schedule meetings with Scedule. Because it can quickly provide date proposals that suit you and everybody invited. Appointments with colleagues and partners are not found in seconds. Really? Try Scedule! It quickly identifies the most suitable dates and professionally involves every attendee. A smart algorithm identifies best times to meet reflecting everybody invited, without sharing calendars. Schedule integrates workplaces and meeting rooms from your groupware and ensures required booking. Instead of manually initiating services or follow-ups, Scedule automates your meeting workflows.Starting Price: $5 per user per year -
18
Axigen
Axigen Messaging
Offer your customers secure, business-level email hosting with various value added services. An excellent solution for SPs, suitable for thousands to millions of users. Acquire new customers by offering a premium email server solution with a high degree of flexibility, allowing you to automate it within your existing infrastructure. Manage your email, organize and share calendars, sync your mobile devices, all based on a secure and powerful mail server. The perfect answer for businesses of all sizes. Axigen is quite knowledgeable, out of the many hats it wears, take a peek inside and choose what fits you. Manage your email and get stuff done easily with calendars, tasks or notes. Enjoy desktop usability in your browser via keyboard navigation and shortcuts, drag-and-drop, "live" email list view, frequent folders, email filters, out-of-office messages, individual blacklist / whitelist.Starting Price: $266 per year -
19
EGroupware
EGroupware
EGroupware offers an online calendar for appointment management, contact management with CRM, tasks, emails, and project management, as well as an online file server. These basic functions are supplemented by the integration of chat, video conferencing, and remote desktop modules to create a sophisticated home office solution. The groupware networks all information on an online company platform that runs in any desktop browser, independent of the operating system. In its mobile version, it also runs nicely on smartphones and tablets. EGroupware is open-source software with agile software development – focused on customer requirements and supplemented by developments of the community. EGroupware is equally suitable for SMEs (small and medium-sized enterprises), city administrations, or even universities, education, and research institutions. Test the online teamwork tool for free! -
20
Scalix
Scalix
Offer a high value Outlook experience with push email, PIM, group calendaring, free/busy services, public folders, delegation, and more. Increase margins with lower server counts and compelling subscription pricing. Reduce your licensing costs and leverage your teams' existing skills with a Linux-based platform. Scalix starter packs are robust, single-server messaging solutions designed to provide smaller businesses and organizations with a full featured email and collaboration solution. Scalix small business edition is our single-server solution designed for small businesses. It includes a rich package of business functionality including a means to instantly recover deleted items on a user-specific basis, wireless device support and more. -
21
MDaemon Email Server
MDaemon Technologies
The MDaemon Email Server was one of the first Microsoft Exchange alternatives offered to businesses around the world. It has been developed with the ongoing input from IT professionals seeking an easy-to-use, reliable, and secure mail server that does not require expensive administration or impose high per-user costs. It simplifies messaging and collaboration with a focus on security and privacy, an intuitive, user-friendly web mail design and by offering administrators Mobile Device Management, Business Instant Messaging, Document Sharing, and other enterprise-class features that can be managed with minimal support. MDaemon Email Server supports IMAP, SMTP, and POP3 protocols, and features include: integrated webmail with IM and document sharing, Outlook support, compromised password alerts, color-coded log files for quick and easy troubleshooting, customizable email policy setting to fit your unique network environment, Mobile Device Management, Account Hijack Detection, and more.Starting Price: $360 per year -
22
Hotstar
Hotstar
Create your professional website in no time at all with a designer from Hoststar. Thanks to individual editing options for tables, buttons, colors and images, you can use our editor to shape your website exactly as you want it. Just move text and images where you want them using drag & drop. My Panel from Hoststar, a feature-rich and intuitive tool that gives you a complete overview with just one login. Taking care of all products, email and domain administration, invoices and commissions is child’s play. Hoststar’s MailPro is the perfect communication solution for those who want more than a standard email application: seamless synchronization of emails, contacts, and calendar entries on all devices, enhanced groupware functionality by means of the intuitive webmail, and an integrated archive function. The right domain is critical to the success of your website. Buy your dream domain today, before it’s too late.Starting Price: $9.90 per month -
23
Microsoft Exchange
Microsoft
Work smarter with business-class email and calendaring. Exchange helps you collaborate on your critical documents and gives you a focused inbox that prioritizes important messages and adapts to your work style, so you can get more done–faster. Get access to a more personalized inbox with helpful features and a smarter, more organized way to view and interact with email. Search enhancements give you faster and more complete results. With Add-ins, get powerful customization and extensibility, which connect you to modern services and internal line-of-business applications. Organize your time with a calendaring system that goes beyond basic scheduling of appointments and commitments. Automatically capture events from email such as flights and hotel reservations, and get suggestions about where to meet based on your location. Microsoft Exchange Online offers a hosted email service for business. Exchange Online helps protect your information with advanced capabilities. -
24
Mail-in-a-Box
Mail-in-a-Box
Mail-in-a-Box lets you become your own mail service provider in a few easy steps. It’s sort of like making your own gmail, but one you control from top to bottom. Technically, Mail-in-a-Box turns a fresh cloud computer into a working mail server. But you don’t need to be a technology expert to set it up. Each Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software. It also includes contacts and calendar synchronization. The box also includes other standard mail functionality like spam protection (spam filtering and greylisting), mail filter rules, email client autoconfiguration, and automated backups to Amazon S3 and other services. The box also includes automatic DNS configuration when you let it become your nameserver so that it can set important DNS records for mail deliverability and security including SPF, DKIM, DMARC, and MTA-STS. When enabled, DNSSEC (with DANE TLSA) provides a higher level of protection.Starting Price: Free -
25
Netframe
Netframe.co
Netframe is an open-source, sovereign digital workplace platform designed to streamline collaboration, communication, and organization within teams. It offers a suite of integrated tools, including email, instant messaging, document storage, calendars, video conferencing, and collaborative editing, all within a customizable intranet environment. Users can personalize their workspace with custom logos, themes, and user profiles, ensuring a tailored experience that aligns with organizational branding. Netframe supports various deployment options—public cloud, private cloud, on-premise, and edge cloud—allowing organizations to maintain control over their data and comply with cybersecurity requirements. The platform is hosted on 100% sovereign European infrastructure, emphasizing data privacy and security. It caters to diverse sectors, including businesses, administrations, communities, and sensitive industries, providing tools to enhance internal communication, etc.Starting Price: $3.00/month/user -
26
hMailServer
hMailServer
hMailServer is a free, open source, e-mail server for Microsoft Windows. It's used by Internet service providers, companies, governments, schools and enthusiasts in all parts of the world. It supports the common e-mail protocols (IMAP, SMTP and POP3) and can easily be integrated with many existing web mail systems. It has flexible score-based spam protection and can attach to your virus scanner to scan all incoming and outgoing email.Starting Price: Free -
27
OpenMeetings
Apache Software Foundation
Openmeetings provides video conferencing, instant messaging, white board, collaborative document editing and other groupware tools. It uses API functions of Media Server for Remoting and Streaming Kurento. OpenMeetings is a project of The Apache Software Foundation, the old project website at GoogleCode will receive no updates anymore. The website at Apache is the only place that receives updates. -
28
grommunio
grommunio
grommunio efficiently summarizes all requirements of modern, digital communication and collaboration. This includes the device and operating system independent management of sensitive data such as e-mail, contacts, calendar, chat, video conference, file sharing and much more – in real time. With open source technology based on Linux, grommunio is scalable and meets the highest security requirements. Thanks to its advanced architecture, grommunio can be integrated into existing systems without great effort. Increase your efficiency by managing emails, contacts, calendars, tasks and much more with just one platform. With integrated enterprise-grade Active Sync, your data is available on all devices in real time. Invite directly from your calendar to online conferences with grommunio Meet, share files of all kinds in grommunio files and talk to your employees at the same time via grommunio chat.Starting Price: €1.99 per mailbox per month -
29
Provide Enterprise
Groupware Technologies
Provide Enterprise® by Groupware Technologies simplifies HIV care management so that you can focus on what matters most: client care. Our flexible software is built on more than 14 years of experience helping Ryan White-funded programs manage complex care for their clients. Our care management software helps managers deliver higher quality care more efficiently by organizing, automating, and streamlining every aspect of the process. Groupware Technologies is an independent software vendor specializing in the design, distribution, and support of its proprietary care management software, Provide Enterprise. Our mission is to help our customers deliver better and more cost-effective care to their clients through process improvements and technology solutions. -
30
DOCUframe
GSD Software
The flexible ECM system DOCUframe - your integrated information and communication platform. DOCUframe: Intelligent support in CRM, groupware, document management and more! As an intelligent information and communication platform, the ECM system DOCUframe supports you in the areas of document management, CRM, groupware and merchandise management. Thanks to the integrated development environment, users are able to adapt the software to the individual processes of their company themselves after appropriate training. The information and communication center in your integrated complete solution. Address management (prospects, customers, suppliers, manufacturers, employees, etc.). Contact person management (AP for each address). Contact management / CRM functionalities. Document archive (archiving of all documents and formats). Product management (product data e.g. merchandise management or web shop connection). Object-oriented database. -
31
Mailtraq
Mailtraq
Mailtraq Professional mail server software is the complete email server for business. It does everything you need at a great price and without hassles. Mailtraq is the ideal Microsoft Exchange Alternative: easy to deploy and simple to manage. Low license cost, no server-CALs, and stability in operation make Mailtraq email server software the choice for all SMB and SOHO businesses. Email is at the heart of your company or organization, and where those messages are stored is of vital importance to the long-term health of your firm. There is a degree of hassle and expense involved in running your own email server but it gives you complete physical control over who has access to your email. If you use your ISP's service then their system administrators can see and read your messages. Similarly, if you use a SAAS supplier for a hosted email service, and if you use a Cloud provider you not only don't know who is reading your email, but don't even know where in the world it is kept. -
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Exim
Exim
Exim is a mail transfer agent (MTA) used in Unixllike operating systems. The first version was written in 1995 by Philip Hazel for use in the University of Cambridge Computing Service's e-mail systems. Exim is distributed under the GPL, and therefore is free to download, use and modify. Exim somewhat resembles Smail 3, but it has diverged and now surpasses it in user friendliness and flexibility. They both follow the Sendmail design model where a single main binary controls all the facilities of the MTA. This monolithic design is considered by some to be inherently less secure and slower, but despite this, Exim's security record is much better than Sendmail and comparable with Qmail and Postfix, as is its speed. In advanced areas such as queue handling, address routing and testing, it exhibits excellent performance. Exim doesn't have a Graphical User Interface (GUI) to help you configure it, but some Linux distributions add one. -
33
Alinto
Alinto
Alinto was born in 2000 as a result of Philippe Gilbert’s vision, whose risk paid off! Bringing together a team of passionate developers and experts in cloud messaging, he innovated the sector with the deployment of the first messaging platform, with a Cloud based email solution in Europe, and the first web based email accessible from a mobile phone. We then became a major player in the European digital arena. As a software mail server provider, our R&D, Marketing and Support teams are committed to adopt an approach focused on availability and proximity. In fact, this is much more than an electronic communication solution, as personalized care and solutions are adapted to your real requirements and needs. Besides, our experts are always available to help. Whether you’re a telecom operator, an internet service provider or an IT specialist, we are here for you. -
34
qmail
qmail
qmail is a secure, reliable, efficient, simple message transfer agent. Security isn't just a goal, but an absolute requirement. Mail delivery is critical for users; it cannot be turned off, so it must be completely secure. qmail's straight-paper-path philosophy guarantees that a message once accepted into the system, will never be lost. qmail also optionally supports maildir, a new, super-reliable user mailbox format. Maildirs, unlike mbox files and mh folders, won't be corrupted if the system crashes during delivery. Even better, not only can a user safely read his mail over NFS, but any number of NFS clients can deliver mail to him at the same time. qmail is vastly smaller than any other Internet MTA. Other MTAs have separate forwarding, aliasing, and mailing list mechanisms. qmail has one simple forwarding mechanism that lets users handle their own mailing lists. -
35
Dovecot Pro
Open-Xchange
Dovecot Pro is a full-service email platform that delivers dynamic scalability, high performance, efficient utilization of hardware, and outstanding support to the world’s largest Telcos, ISP's, and Hosters. With a marketshare of 76% of installed email backends, customers trust the performance of Dovecot Pro. Efficient hardware utilization and advanced monitoring tools for statistics and administration reduce ownership costs and save time and maintenance costs. In addition, Dovecot Pro scales up and out to hundreds of servers and millions of users and multiple physical sites. Its stateless native architecture offers maximum flexibility as each major component can be deployed on its own dedicated node. Dovecot Pro provides industry-leading support for all email standards necessary to provide both Mail Delivery Agent functionality (via LMTP and Sieve), and to facilitate mail retrieval by mail clients (via IMAP and POP3). -
36
Kolab Now
Apheleia IT AG
Secure and private email, calendars and more. 100% Free & Open Source Software (FOSS). Open standards and formats used for all storage and communication. No vendor lock-in. All data stored under Swiss jurisdiction. User data never transmitted to any third party without explicit consent. GDPR, HIPAA and PCI compliant. Built secure from the ground up. Supports perfect forward secrecy (PFS). End-to-end encryption available. No back doors. Our documentation contains answers to most frequently asked questions and much more. Are you looking for an instant answer to your question or a quick solution for your problem, our Knowledgebase is where you will likely find it. If you can’t find the answer in our documentation, you can always contact support.Starting Price: $9.90 per month -
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Apache James
The Apache Software Foundation
James stands for Java Apache Mail Enterprise Server. It has a modular architecture based on a rich set of modern and efficient components which provides at the end complete, stable, secure, and extendable Mail Servers running on the JVM. Create your own personal solution of email treatment by assembling the components you need thanks to the Inversion of Control mail platform offered and go further customizing filtering and routing rules using James Mailet Container. The Apache James project wires together the different libraries composing James to provide running services, ready to download on the Apache mirrors.Starting Price: Free -
38
iRedMail
iRedMail
The right way to build your mail server with open source softwares. Works on CentOS Stream, Rocky, Alma, Debian, Ubuntu, FreeBSD, OpenBSD. With iRedMail, you can deploy an OPEN SOURCE, FULLY FLEDGED, FULL-FEATURED mail server in several minutes, for free. We did the heavy lifting of putting all the open source components together and applying best practices. Our product does all the major tasks for you. Furthermore we offer professional support to back you up in case you have some problems. You have all personal data on your own hard disk, you can control the email security, inspect transaction log. No other organization can see the content of all messages. All components used in iRedMail are open source softwares, and you get the bug fixes and updates from the Linux/BSD venders you trust. iRedMail is the right way to build your mail server with open source softwares.Starting Price: Free -
39
OfficeCalendar
Lookout Software
OfficeCalendar for Microsoft Outlook is an easy-to-use software application designed for sharing Microsoft Outlook information between colleagues and coworkers. OfficeCalendar is an affordable alternative to Microsoft Exchange Server, which is considered to be too expensive and complex for many small to mid-sized businesses. With OfficeCalendar, coworkers can share their Microsoft Outlook calendars, email, contacts and tasks; create group calendars; and control OfficeCalendar’s comprehensive sharing security; all from within their own copy of Outlook. Colleagues can also access their personal and shared Outlook folders (calendars, contacts and tasks) online using OfficeCalendar Online, giving users Outlook web access from anywhere or at any time. Share Microsoft Outlook Calendars with colleagues. Create interactive Outlook group calendars for easy group scheduling.Starting Price: $99.00/one-time/user -
40
Zentyal
Zentyal
Join Windows® clients to the domain and manage them transparently. No disruption to your users, no user or device CALs. Comes with industry-standard SMTP and POP3/IMAP mail server built upon the most established technologies and protocols. Guarantees reliable and secure Internet access and helps to manage all the basic network infrastructure services. Receive software updates until the EOL-date of each version and get support when needed. Zentyal offers an easy to use Windows Server® alternative. It comes with native compatibility with Microsoft Active Directory® allowing you to join Windows® clients to the domain and manage them easily, causing no disruption to your users. Zentyal includes the industry-standard SMTP and POP3/IMAP mail servers built upon the most established technologies and protocols. Gives you the opportunity to deploy Zentyal as a mail server, domain & directory server with mail or all-in one server.Starting Price: €195 per server -
41
IceWarp
IceWarp
The only office rule is, there is no office. Business email, TeamChat for project teamwork, real-time office document collaboration and online meetings. All in our secure cloud and for half the usual cost. Chat in teams organized around projects, upload files, mention coworkers, comment on posted emails, pin important posts. Integration with email enables sharing received messages directly to TeamChat room for colleagues‘ attention. Skyrocket your office work effectivity with Desktop Client and Desktop Office documents on Windows as well as Linux devices. Get the complete Suite, or choose only the app you need.Starting Price: $312.00/year/user -
42
david3
Tobit Software
Information exchange with employees, customers, partners and suppliers, organize tasks and projects and bring teams together – you can do that by using many different programs. Or david3! Everything is in there in a single software package. david3 makes companies fast! In the InfoCenter, all information from different sources converges. eMail, Fax, VoiceMail, E-Mail - everything there. Chat and LiveComments make the exchange quick. Shared inbox folders, calendars, and more: with david3, employees become teams. Projects, tasks and appointments can be easily coordinated at the touch of a button. Don't be afraid of viruses, spam, phishing or fake emails: david3 keeps the store clean. Whether in the office, in the home office or somewhere in nowhere: david3 is hypermobile. No media breaks, no compatibility issues. At david3, everything is just one piece. david3 is based on a purebred client/server architecture.Starting Price: €295 -
43
Haraka
Haraka
Haraka can serve thousands of concurrent connections and deliver thousands of messages per second. Haraka and plugins are written in asynchronous JS and are very fast. Haraka has very good spam protection (see plugins) and works well as a filtering MTA. It also works well as an MSA running on port 587 with auth and dkim_sign plugins enabled. Haraka makes no attempt to be a mail store (like an exchange or postfix/exim/qmail), an LDA, or an IMAP server (like Dovecot or courier). Haraka is typically used with such systems. Haraka has a scalable outbound mail delivery engine built in. Mail marked as relaying (such as via an auth plugin) is automatically queued for outbound delivery. Haraka's plugin architecture provides an easily extensible MTA that complements traditional MTAs that excel at managing mail stores but do not have sufficient filtering.Starting Price: Free -
44
Mercury Mail Transport System
Pegasus
Mail from the outside world is received by Mercury and placed in the addressee's mailbox, where the user can access it at any later point. Messages sent by local users to the outside world are passed to Mercury, which then takes whatever steps are necessary to deliver them, removing the burden from the user's workstation and allowing him to continue with other work. If you connect using a dialup connection, then only the mail server needs to be able to access that connection. Your workstations do not need their own modems or Internet accounts. The mail server can continue processing mail even when the client workstations are turned off, allowing functions that depend on a continuously available service, such as automatic replies and auto-forwarding. -
45
Oracle Beehive
Oracle
Oracle Beehive is the next generation of Oracle's enterprise collaboration technologies. Oracle Beehive provides a unified collaboration application and platform comprised of a comprehensive set of integrated Java-based services, offering a new paradigm for enterprise collaboration solutions. Oracle Beehive unifies common yet typically disjointed collaborative services, such as e-mail, time management, instant messaging, and content management, among others, and delivers them through standard protocol clients, integrated Web services, and familiar desktop tools such as Microsoft Outlook. This unified offering enables teams, individuals, and organizations to more easily collaborate, generate new information, make timely decisions, and, ultimately, take action. Oracle Beehive allows IT departments to consolidate their collaboration-enabling infrastructures and implement people-centric, rather than tool-centric, applications in a centrally managed, secure, and compliant environment.Starting Price: $50.00/one-time/user -
46
Amazon WorkMail
Amazon
Amazon WorkMail is a secure, managed business email and calendar service with support for existing desktop and mobile email client applications. Amazon WorkMail gives users the ability to seamlessly access their email, contacts, and calendars using the client application of their choice, including Microsoft Outlook, native iOS and Android email applications, any client application supporting the IMAP protocol, or directly through a web browser. You can integrate Amazon WorkMail with your existing corporate directory, use email journaling to meet compliance requirements, and control both the keys that encrypt your data and the location in which your data is stored. You can also set up interoperability with Microsoft Exchange Server, and programmatically manage users, groups, and resources using the Amazon WorkMail SDK. Amazon WorkMail features simple, low, monthly per-user pricing and costs $4 per user per month which includes 50GB of storage per user.Starting Price: $4 per user month -
47
CommuniGate Pro
CommuniGate Software
Our end to end Unified Communications technology begins with the platform CommuniGate Pro. The system enables large scale Unified Communications with open API’s for integration into business applications. CommuniGate Pro scales dynamically to 100’s of millions of accounts. Ideally suitable for “Nation” scale alert systems, multimodal communications within web applications, or compartmentalized high-security network topologies. However, big scale does not mean trade-offs on efficiency or reliability. The platform is extremely agile for resilient applications in military or embedded environments. CommuniGate Pro is approved for governmental agency use in Europe and in the USA. Military, transportation and research center use is legendary for mind bending stability with uptimes like VMS. CommuniGate Pro enables banks to deploy mail to millions of clients for online self care while respecting compliance regulations. The signaling features of the server can be deployed in a hybrid system. -
48
Modoboa
Modoboa
Regain your independence and protect your privacy by installing your own email server. It takes less than 10 minutes! Create your mail server for free in less than 10 minutes with Modoboa When it comes to create a mailbox, you generally have several solutions: - Use the services offered by Internet providers (Orange, Vodafone...) of infrastructure providers (OVH, Gandi...) with a monthly or annual subscription. However, customization and configuration possibilities, domains and mailboxes number are limited. - Use the services of free email providers (Gmail, Live, Yahoo...) which are limited and your data is used for commercial purposes. - Install your own email server, which requires important technical knowledge to setup and configure the system. Modoboa is an alternative to those 3 options. It frees you from dependence on email providers and makes accessible to all the creation his own secure email server. The whole thing, in less than 10 minutes and freely.Starting Price: Free -
49
Poste.io
analogic
You can have a fully functional mail server installed in a few minutes, mostly waiting for scripts to do the work. The whole package is designed with reasonable defaults to get you up and running quickly, without having to know the internals and without making decisions that could break the email system. User data and configuration is strictly separated from binaries. User database is stored in SQLite database - in file. This makes Poste.io fully compatible with external storage. Migration, backups or updates are therefore very easy and mostly consist of files manipulation. Poste.io has been built from the ground up with security in mind. Internet history is littered with painful security incidents, so we traded old email client compatibility and insecure authentication methods for features that meet today's for features that meet modern security requirements.Starting Price: Free -
50
Cyrus IMAP
The Cyrus Team
Cyrus IMAP is an email, contacts and calendar server. Cyrus is free and open source. Features: Speed Security Efficiency Search CardDAV and CalDAV support Robust data storage Replication Scalable for large installations Flexible filtering support through Sieve Supports antivirus and antispam toolkits Handles deliverability: SPF, DKIM, DMARC Extensive authentication options, through Cyrus SASL JMAP support Long list of supported standardsStarting Price: Free
