Path: utzoo!utgpu!attcan!uunet!mcvax!kth!draken!chalmers!cs.chalmers.se!lindberg
From: lindberg@cs.chalmers.se (Gunnar Lindberg)
Newsgroups: comp.mail.sendmail,swnet.mail
Subject: mail to .at domain
Message-ID: <2898@fnatte.cs.chalmers.se>
Date: 17 Mar 89 13:40:56 GMT
Sender: news@cs.chalmers.se
Organization: Chalmers University of Technology, Sweden
Lines: 28

We've run into an interesting problem: Somebody got a mail from a
user at  "edvz.uni-salzburg.ptt.at" and tried to reply to it.
Note the top level domain, which is registered for Austria with
"uunet.uu.net" and "aos.brl.mil" as NS:s (MX only).

Now, what happened was that we tried to forward it and thus re-wrote
it using "%...@"-syntax (yes I know, it's not "pure RFC822" :-) into:

    "user%edvz.uni-salzburg.ptt.at@kth.se"

Then "sendmail" found the "at" and changed it into an "@" - look at
"sendmail.cf", rule S3:

    R$+ at $+		$1@$2		"at" -> "@" for RFC 822

Guess what happened to "usr%edvz.uni-salzburg.ptt.@@kth.se"...

Those who just said "it's non RFC822" should try "usr@foo.at.bar", :-).

I've tried to just exclude the line from "sendmail.cf" and it seems
to work quite well since "sendmail-5.59" catches "user at domain" in
its argument list and converts it there. What doesn't work is the
"To:" and "Cc:" lines, which will then stay as "usr at domain". I
also guess "-t" doesn't work any more, although I haven't tried it.

Has anybody else seen this? Is there a simple fix to it?

	Gunnar Lindberg