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Postfix Archives: Re: 2 SMTP Relays, depending on the From: add

Re: 2 SMTP Relays, depending on the From: address

Subject: Re: 2 SMTP Relays, depending on the From: address
From: Craig Sanders (castaz.net.au)
Date: Mon Jan 03 2000 - 17:24:32 CST

On Mon, Jan 03, 2000 at 11:27:23PM +0100, Martin Schulze wrote:
> > wietse has already given you a technical solution to the problem,
> > here's
>
> Darn, apparently I missed it. However I have already asked if postfix
> would be able to do it and got the response that I was the first one
> needing it, *sigh*

i've still got the thread in my postfix-users folder...i'll forward you
a copy. summary is to run two instances of postfix with different config
files.

> > complain to your ISP, they shouldn't be doing that...using the From:
> > address for relay control is broken-by-design and brain-damaged.
>
> It's called policy-based-routing and it is not brain-damaged.

sorry, but it IS a brain-damaged implementation. relay control should be
by IP address, not by domain name in the From: address. i.e. local IP
addresses should be able to relay an email with any From address they
like. non-local IP addresses should not be allowed to relay at all (with
exceptions for pop-before-smtp or whatever, of course).

> Guess you've got a leased line to your university, though no
> commercial traffic may pass. However, you've got an own business
> where you need to write mails as well. Solution a) Get a modem, use a
> shell login at your provider's, solution b) also get a modem, but use
> dialup via uucp or ppp and dump & receive commercial mails using that
> way.

uucp over tcp is a good way of avoiding dumb ISP policies, especially
if you can find a uucp provider who uses stunnel or similar to allow
ssl encrypted uucp connections. see http://taz.net.au/postfix/uucp/
for an example of how to set this up (a howto on setting up uucp with
stunnel...it assumes you already know taylor uucp reasonably well).

craig 

--
craig sanders

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