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From: jimc@quintus.com (Jim Crammond)
Newsgroups: mail.uk-sendmail-workers,comp.mail.sendmail
Subject: Resolving domain ordering problems
Message-ID: <551.9011050151@brodgar.quintus.com>
Date: 5 Nov 90 01:51:15 GMT
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In-Reply-To: Malcolm.Harper%prg.oxford.ac.uk@sun.com's message of Thu, 1 Nov 90 16:10:15 GMT <9011011610.AA22151@gruffle.prg.ox.ac.uk>
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| There doesn't seem to be any way to override this from the domain and channel
| tables -- does anyone have any suggestions?

There's no nice way to do this - you have to consider issues like where should
user@ph.sun - is it a subdomain of ph.ox.ac.uk or is it sun.ph?
A better example is "cs"; is hw.cs really heriot-watt.computer-science
or some institution in Czechoslavakia?

You basically have 2 choices: remove the top level domains like "ph" and "cs"
and force users who really mean to mail to these countries to explicitly
route through a uk gateway - user@ph can then route locally as it usually
should; or do a clever trick.

Here's one from the clever tricks department which basically stuffs extra
rules in ruleset 10 to override the nameclash. Add the following rules
to your local domain table:

	@ph		@uk.ac.ox.ph	# convert to nrs form
	@uk.ac.ox.ph	@ph.ox.ac.uk	# nrs to 822 form
	@mx		@uk.ac.mx
	@uk.ac.mx	@mx.ac.uk


This also ensures that uk.ac.ox.ph is not considered a subdomain of ph.

I think I would use the trick for ph and mx but
would delete cs from the top level domain list.

-Jim.