A customer is suffering with an older version of a Windows "Mail Server" software that does not permit connections to _other_ ports (25 only). Several of the domains they host have users who's ISPs block port 25 so they can not send mail.
They'd like to set up an outbound (relay?) SMTP server for those customers using per user@domain.tld authentication. Since I personally use Postfix with dovecot SASL I'd prefer doing the same for them.
The only issue I see is how to "disable" IMAP and POP3 and use only the SASL authentication feature. I read that Timo is thinking to _someday_ :-) separate the SASL authentication from the rest of Dovecot, but in the mean time can I just leave out the IMAP and POP3 stuff from dovecot.conf, or is there a disable option?
Of course I'll clamp the IMAP and POP3 ports down with iptables but it would be nice knowing Dovecot would just say go away or ignore those connections.
Is anyone doing this or have any suggestions, thoughts, or ideas about it?