[Greylist-users] Exim>Postfix solution?

[Sean Harbour]

Well, for now, we are going to install Exim on our Postfix machines. Exim
will act
as a proxy for Postfix, which will run on an alternate port from 25. This
should be a quick
fix for now, and we can re-evaluate later. Any comments or suggestions?

Sean Harbour

>I was originally tasked with the postfix implementation.  It's my MTA of
>choice.

>However, I ran up against two barriers:
>1) Though I'm a perl nut, I'm mostly a database guy, not much of a network
>programmer.
>2) The postfix filter architecture, as I understand it, would not make the
>senders IP address available to the filter.  The filter, itself a small
>SMTP daemon, would see the mail as originating from localhost.

>Issue #1 can be considered as damage, and we can route around it.

>Issue #2 is a lot trickier.  We can write a smtp daemon to sit in front of
>postfix (or any other MTA for that matter).  We can hack postfix to add
>greylisting support.  We can hack postfix to include the IP address in the
>HELO line.  We can use the older pipe-based filter to wait until after the
>DATA phase.

>Or, Somebody might discover that I read the docs completely wrong, and
>whip off a postfix greylist filter in an afternoon.  I really hope this is
>the case.