Re: MTA or SMTP proxy?

On Fri, Jul 03, 2009 at 10:58:34PM +1000, Barney Desmond wrote:
> > I think, protocol itself is just the communication between MTAs (it does not
> > store anything itself, MTAs which uses the SMTP can/must store things while
> > using SMTP to communicate with other MTAs).As proxy level firewalls has got
> 
> Okay, this is getting to semantics. SMTP is your transport for pushing
> messages between entities that can store messages. It sounds like you
> want some sort of SMTP protocol-level filter. Postfix can't do this in

Yes, yes, that's what I said, and I used the $subject just because to make
my question clear, I was quite sure that postfix is an MTA and not an SMTP
proxy :)  [or filter, or how we would like it to be called] If it went to be
offtopic too much, I'm sorry.

> a comprehensive way such as you describe, but it achieves a lot of
> basic, related, important functionality (eg. recipient verification,
> because Postfix often performs the mailstore function as well.
> 
> At this stage I need to ask: what is your question here? I haven't

First I had the hope that there is some chance to make postfix work like
this, but yes, it's an MTA, not a filter/proxy. Just I was confused with
some "before queue" things I had heared before, so I thought it's possible
somehow to "rape" it to work this way even with some external patches or who
knows ... And I was curious about the opinions of people here in general.

> tried it, but you may be interested in ASSP, I believe it fits the
> definition of an SMTP proxy:
> http://assp.sourceforge.net/

Hmm, thanks a lot, I will check it out!

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- Gábor