#2 List file access clash

[randonneur]

When using $ADDLIST() to write several entries to a list in a short span of time, some entries are lost as parallel threads replace each others' newly created files. In some cases a "file access denied" alert is produced, leaving .tmp files in the list directory.

The easy way to replicate the problem is to create an outgoing header filter that does an $ADDLST() for each connection.