qmail dead ? was: [Gllug] ezmlm status?

[C. Cooke]

On Thu, Mar 18, 2004 at 04:10:03PM +0000, Bruce Richardson wrote:
> On Thu, Mar 18, 2004 at 03:42:37PM +0000, Jason wrote:
> > On Thu, 18 Mar 2004, Tethys wrote:
> > 
> > > Try routing mail based on sender, rather than recipient. This is where
> > > sendmail comes into its own, and I haven't found other MTAs than can
> > > match it. Yes, I know it's not a common thing to want to do, but we
> > > had a legitimate business reason for it.
> > 
> > This can be done in postfix using the smtpd_sender_restrictions rule and a 
> > suitable access map. You might have to implement it using a filter rule 
> > in the access map but that is very easy.
> 
> I don't think that does what Tet was referring to.  I'm quite sure it
> doesn't.  Sender-based routing is where you decide how to route a
> message (i.e. what the next delivery step is, local or remote) based on
> the sender address or host.  All you can do with
> smtpd_sender_restrictions is limit what Postfix will accept in the MAIL
> command: you can't affect which transport will be used.
> 
> There has been a little-mentioned sender-based routing mechanism in
> Postfix for a while (try googling on 'sender_based_routing=yes') but
> it is quite clumsy, because it makes all transports use sender-based
> routing rather than recipient-based routing.  Thise means you really
> have to run multiple instances of postfix, some with sender-based
> routing and some with recipient-based routing.
> 
> Given that a) Wietse simply doesn't believe that it is something that an
> SMTP MTA should be attempting and b) Postfix's design makes it
> fundamentally difficult to implement, practical sender-based routing is
> unlikely to appear in Postfix any time soon.

Easy on exim, though:

sender_router:
	driver = redirect
	data = ${lookup{$sender_address}{/etc/mail/sender_routes}}
	...

etc.

There are probably better ways of doing that, too... But the above would
be efficient and easy to use.

-- 
Charles Cooke, Sysadmin
Say it with flowers, send a triffid.
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