I have used neither and I would really look towards exim4 or one of the other mail frontends to do all the queueing etc., especially if this is going to be a hurried replacement.

Later on, you can still implement forwarding rules to a (local) different mailserver written in Perl.

I'd look at qpsmtpd (old, but likely still usable), and AnyEvent::SMTP, but both parse the complete mail before handing it off to you.

Alternatively, as long as you can assume that all incoming mail will be well-behaved, maybe just faking the SMTP protocol from a plain socket is Just Enough - but I'd still look towards a proven mail server first and gradually replace it by forwarding selected mails to other servers.

In reply to Re: SMTP Server - which module by Corion
in thread SMTP Server - which module by cavac

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