[aclug-L] Re: MTAs & maildir vs mbox (was Re: Virtual POP3 and IMAP server)

[Chris Owen <owenc@xxxxxxxxxxxx>]

On Fri, 19 Oct 2001, Jonathan Hall wrote:

> > For inbound MX and outbound SMTP we are probably going to be moving away
> > from sendmail.  Postfix looks like the winner now, mainly because of the
> > ease with which you can handoff to external filters.  We scan all incoming
> > email (and will be scanning outbound) for virii and that is a bit harder
> > to do with sendmail (milter is not ready for prime time in my opinion).
>
> Along those lines, perhaps qmail for my POP3/IMAP server would be ideal...
> and sendmail or postfix for my outbound relay?
>
> You chose postfix... any specific reason(s) why?

Because of its very module nature it is well suited for hooking in
external filters or processing.  Basically it is made up of several
dameons and several more handling programs that all hand off mail from one
to the other.  Adding a new piece to that is a simple as modifying a
config file.  Mail contents are just piped to the new piece which does its
magic and then pipes it on to the next piece.

> Can you comment on sendmail and/or postfix's ability to support SSL
> and/or authenticated relaying (is that the correct term?).

postfix will authentic on just about anything (IP, domain, client,
smtp-auth, db, ldap, you name it).  It will let you combine these so that
you can have people trying to relay "fall through" your various levels of
authentication until they get to one they can meet.

> My goal with the authentication is to allow traveling clients to relay
> through my server even though their IP address is not one that would
> normally be allowed to relay.  I don't want to REQUIRE authentication,
> tho (altho if required, I suppose I could run one server that requires
> auth and one that doesn't, and tell my clients to use whichever suits
> their needs... I prefer a single server, though, for ease of client
> configuration)

We've not done in anger yet, but in theory postfix will let you do this.
ie, authenticate based on source IP and then auth-smtp if that fails.

Chris

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