Received: from localhost (daemon@localhost) by cs.utk.edu with SMTP (cf v2.9s-UTK) id JAA19900; Thu, 8 Jun 2000 09:18:46 -0400 (EDT) Received: by cs.utk.edu (bulk_mailer v1.13); Thu, 8 Jun 2000 09:14:56 -0400 Received: by cs.utk.edu (cf v2.9s-UTK) id JAA19400; Thu, 8 Jun 2000 09:14:55 -0400 (EDT) Received: from unni.dsv.su.se (marvin@localhost) by cs.utk.edu with ESMTP (cf v2.9s-UTK) id JAA19376; Thu, 8 Jun 2000 09:14:52 -0400 (EDT) Received: from unni.dsv.su.se (130.237.161.27 -> unni.dsv.su.se) by cs.utk.edu (smtpshim v1.0); Thu, 8 Jun 2000 09:14:52 -0400 Received: from [130.237.161.46] (dsvmc046.dsv.su.se [130.237.161.46]) by unni.dsv.su.se (8.9.3+Sun/8.9.3) with ESMTP id PAA01286 for ; Thu, 8 Jun 2000 15:14:50 +0200 (MET DST) Mime-Version: 1.0 Message-Id: In-Reply-To: <2616520932.960394227@JKLENSIN01> References: <2616520932.960394227@JKLENSIN01> Date: Thu, 8 Jun 2000 15:11:03 +0200 To: drums@cs.utk.edu From: Jacob Palme Subject: Re: Outstanding issues for smtpupd-12 Content-Type: text/plain; charset="us-ascii" List-Unsubscribe: At 16.10 -0400 0-06-07, John C Klensin wrote: > SMTP systems are expected to make every reasonable effort > to accept mail directed to Postmaster from any other > system on the Internet. However, in extreme cases, it > may be necessary to block all mail from a given > origination address or domain to prevent denial of > service attacks, and this requirement is not intended to > preclude SMTP systems from offering such security > facilities when unavoidable. Denial of service attacks by clever attackers may not be detectable by a "given origination address or domain". -- Jacob Palme (Stockholm University and KTH) for more info see URL: http://www.dsv.su.se/jpalme/