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From: dudek@ubglue.UUCP
Newsgroups: comp.mail.misc
Subject: Re: Info on IDA Sendmail kit / pathalias
Message-ID: <188@ksr.UUCP>
Date: Tue, 29-Sep-87 17:52:53 EDT
Article-I.D.: ksr.188
Posted: Tue Sep 29 17:52:53 1987
Date-Received: Sat, 3-Oct-87 01:24:02 EDT
References: <20962@ucbvax.BERKELEY.EDU> <1692@umix.cc.umich.edu>
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Reply-To: dudek@ksr.UUCP (Glen Dudek)
Organization: Kendall Square Research, Cambridge MA
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In article <1692@umix.cc.umich.edu> honey@citi.umich.edu (Peter Honeyman) writes:
>i suppose it's possible to make the local mailer a router that looks at
>the address and passes the message back to sendmail ... maybe not.
>
>i've seen sendmail hacks (from waterloo?) that let rewrite rules munge
>addresses with $>program.
>
>	peter

Yes, it is possible, and is how I arranged pathalias to work on Harvard.
The only tricks are to be sure and avoid indefinite recursion, and to be
prepared for two sendmail invocations for every rewritten address.
I avoided recursion by appending ';nopath' to uucp paths which had
already been pathaliased - this of course required sendmail configuration
support to pass this through ruleset 3 in the right place, and to strip it
in ruleset 0 after it was used to suppress another call to pathalias.
Any of you who received bounces from Harvard of the form 'host!user;nopath
Unknown host' now know where it comes from.

Sendmail changes to allow arbitrary rewriting of addresses by programs
should be better all around, but if you lack the proper mods feel free
to peruse the stuff in 'mail/sendmail.cf.tar' anonymously ftp-able from
harvard.harvard.edu.

	Glen Dudek
	ex-postmaster@harvard.harvard.edu