Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site hou3c.UUCP Path: utzoo!watmath!clyde!burl!hou3c!Margolin@MIT-MULTICS.ARPA From: Margolin@MIT-MULTICS.ARPA (Barry Margolin) Newsgroups: net.mail.headers Subject: Re: Name data base or Name and Host data base Message-ID: <840919064304.199768@MIT-MULTICS.ARPA> Date: Wed, 19-Sep-84 02:43:00 EDT Article-I.D.: hou3c.848 Posted: Wed Sep 19 02:43:00 1984 Date-Received: Thu, 4-Oct-84 03:22:18 EDT Sender: ka@hou3c.UUCP (Kenneth Almquist) Lines: 11 To: Jacob_Palme_QZ@QZCOM.MAILNET Cc: header-people@MIT-MC.ARPA A problem with your proposals (2) and (3) is that they violate the sanctity of the local-part. Your software that might try to recognize AAA!BBB!CCC%DDD@EEE as meaning the user CCC on Usenet host BBB would be making possibly incorrect assumptions about how EEE parses its local parts. On a suitably unusual computer "AAA!BBB!CCC%DDD" could be a local user name; there is no way for your site to know how what those special characters mean to EEE. If, perhaps, you know that EEE treats % in the local part as synonymous with @, then you have the next level of assumption, about how DDD parses ITS local-part, and then AAA. barmar