#7 gmail and other IMAP servers now require SNI

[nyet]

wmbiff/gmail imap4: Need new connection to ***@gmail.com@imap.gmail.com
wmbiff/gmail comm: certificate passed time check.
wmbiff/gmail comm: server's certificate (OU=No SNI provided\; please fix your client.,CN=invalid2.invalid) does not match its hostname (imap.gmail.com).
wmbiff/gmail comm: server's certificate does not match its hostname.
wmbiff/gmail comm: to ignore this error, run wmbiff with the -skip-certificate-check option

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=917993