Path: utzoo!attcan!uunet!mcsun!ukc!edcastle!cs.glasgow.ac.uk!daemon
From: A.Macpherson@stl.stc.co.uk
Newsgroups: mail.uk-sendmail-workers,comp.mail.sendmail
Subject: Re: inverted alias lookup?
Message-ID: <8019.9010252245@helios.cs.hw.ac.uk>
Date: 25 Oct 90 22:51:23 GMT
Sender: daemon@cs.glasgow.ac.uk
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In-Reply-To: Message from "Steve Platt" of 25 Oct 90, 2:54 pm
Organisation: STC Technology, London Road, HARLOW, Essex England, CM17 9NA
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Original-Sender: A.Macpherson@stl.stc.co.uk

Steve, and anyone else who wants to use a standard Sun sendmail, rather
than the IDA versions.  (Available from Brunel and STL)

This is one for your localise.sh

Define a map eg Y for the reverse YP

DYmail.byaddr

Then as the first line in ruleset 4

R$-@$*		$:${Y$1@$2$}

This will only affect headers, since transport addresses are still in <>
and will fix up for every delivery channel

There is a possible "catch" in that it is usual in uk-sendmail for the
domain component to be the cannonical domain by this stage --- you might
need to load up:

id: id@host
f.u.llname: id@domain

to get the (reverse) mapping you want to achieve.  You can check by running
test mode, for rules 3,1,20,4 and looking at what is passed in to 4

Short plug:  I have explicit rules in a modified uk-sendmail, both for this
and for MX based routing, with a default if no MX record is found.  FTAM or
Niftp to stl, ANON/guest login, file sendmail.cf/UK2.1.stc.tar.Z
-- 
A.Macpherson@stl.stc.co.uk     - or -      Post@stl.stc.co.uk
"Quot homines, tot sententiae"