On Thu, 23 Jul 2009, Andrew Thompson wrote: > I'm a little confused by this entry in my log: > > Received: from adsl-dynamic-pool-xxx.fpt.vn (unknown [118.71.113.83]) > by mx.myserver.com (Postfix) with ESMTP id DAB68800D3 > for <__use...@aktzero.com>; Thu, 23 Jul 2009 18:23:54 +0000 (UTC) > > If I `host 118.71.113.83`, I get: > > 83.113.71.118.in-addr.arpa domain name pointer adsl-dynamic-pool-xxx.fpt.vn. > > So where did the "unknown" come from, was that in the HELO?
No, Ralf already explained the source of 'unknown'. It seems that adsl-dynamic-pool-xxx.fpt.vn was the EHLO sent by the client. The Received: header typically begins like: Received: from <helo/ehlo name> (<client name> [client IP]) except when $smtpd_helo_required = no (the default) and the client does not send a HELO/EHLO; in that case, I believe <client name> is displayed in lieu of <helo name>. -- Sahil Tandon <sa...@tandon.net>
