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Subject: '%1...' virtual user support in Postfix
From: Metronet Technical Support (supportmetronet.co.uk)
Date: Thu Mar 16 2000 - 08:09:19 CST

Hi there. Sorry if I get this all wrong - this is only the second time I've ever used a mailing
list :)

Basically, I work for an ISP, and we want to move over from Sendmail to Postfix. We've used it
in a couple of other situations, and it seems to work fine.

The majority of our hosted sites use mail forwarding to local accounts, eg:

soandsodairylogic.co.uk andrewlocaldomain
dairylogic.co.uk andrew2localdomain

This just means soandso goes to andrew, and anything else goes to andrew2.

This will work fine in PostFix, as we're using exactly that on other servers running new
systems. However, some sites on our main server have forwarding as follows (e.g.):

dairylogic.co.uk %1dairylogic.freeserve.co.uk

In case anyone isn't sure, this basically means:

Anyuserdairylogic is forwarded to the-same-userdairylogic.freeserve.co.uk

We really need to be able to set up something similar to this to be able to shift all of the
mail hosting across. However, I can't find any reference in any postfix docs as to how to do
this. I would be surprised if it's unsupported, as I would imagine that it's something which is
quite easy to implement.

As far as we can see, the only way to do this would be to set up a regexp for each individual
domain in the main config file (or possibly in an include file - I haven't looked into that -
does postfix support includes?). This isn't really an option, partly because we have so many
domains, partly because we're going to need to give control of domains to customers
automatically - so we can't allow them to modify the main config file, and partly because we
would like to be able to keep all dynamic settings (i.e. changes customers make) in the same
file, such as a virtual mapping file. Yeah, I know points 2 and 3 are basically the same -
sounds better though :)

Anyway, I was wondering if anyone has any ideas. I'd expect someone else to have run into the
same problem, and hopefully to have figured out a solution.

Many thanks in advance,

Andrew Clark.