> Common Name (FQDN of your server) []: fstaals.net
The first answer that come to my mind is that your IMAP{ server is
certainly NOT called "fstaals.net", but it should rather be
"imap.fstaals.net" or "mail.fstaals.net" or something.
You must put the exact name of your server, as it is known by DNS and
reverse DNS.
Olivier