From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <200304031709.h33H9XGS080683@orthanc.ab.ca>
From: Lyndon Nerenberg {VE6BBM} <lyndon@orthanc.ab.ca>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] rewriting From:
In-reply-to: Your message of "03 Apr 2003 17:55:09 +0200."
             <1049385309.1074.58.camel@perro>
Date: Thu,  3 Apr 2003 10:09:33 -0700
Topicbox-Message-UUID: 897e29dc-eacb-11e9-9e20-41e7f4b1d025

>RFC-821 says that CNAME is supposed to be rewritten but

that RFC has been replaced by RFC 2821 where that text was removed.

>I take a look to rfc 2476 "message submission" and says

>   NOTE:  Unconditionally resolving aliases could be harmful.  For
>   example, if www.example.net and ftp.example.net are both aliases for
>   mail.example.net, rewriting them could lose useful information.

And that's why RFC 2821 dropped the text about canonicalization. This
was done to accomodate the current-day practice of hosting "virtual
domains" on a single mail server.

--lyndon