On 2/12/2015 12:43 AM, LuKreme wrote: > >> On Feb 11, 2015, at 6:20 PM, Wietse Venema <wie...@porcupine.org> wrote: >> >> LuKreme: >>> Received: from thenewestsecret.net (unknown [170.130.246.215]) >>> by mail.covisp.net (Postfix) with ESMTP id 00E42212DC0 >>> for <*bob*@covisp.net>; Tue, 10 Feb 2015 08:53:22 -0700 (MST) >>> Delivered-To: *bob*@covisp.net >>> Received: by 170.130.246.215 with SMTP id >>> 998S7h4.33K03w6s2R18O2.22351x4s23d1n26; >>> Tue, 10 Feb 2015 08:51:05 -0700 (PST) >>> X-Received: by 170.130.246.215 with SMTP id 134G6f10K6Z34b712c43li; >>> Tue, 10 Feb 2015 08:51:05 -0700 (PST) >>> Received: from thenewestsecret.net (thenewestsecret.net. ) >>> by mx.google.com with ESMTP id >>> 59333u4l19.1C4P11z.147.0.5.1.2.5.5.5.1.0.7.0.4 >>> for <*bob*@covisp.net>; >>> Tue, 10 Feb 2015 08:51:05 -0700 (PST) >>> Mime-Version: 1.0 >>> Date: >>> Message-Id: <235.946____781y2r0b6qn6-c...@thenewestsecret.net> >>> To: *bob*@covisp.net >> >> This message contains a Delivered-To: *bob*@covisp.net header. >> Apparently, the sender added this to trigger a delivery error. >> Apparently, the sender, c...@thenewestsecret.net, wants to receive >> a bounce message. That message would confirm that *bob*@covisp.net >> is a valid email address. > > Does it make sense to reject messages with a Delivered-To: header?
Yes. Incoming mail with that header cannot be delivered by postfix, regardless whether it's really looping or not. Although in this particular case it might be better to reject the spammy-looking client. > > Why does it generate a mail loop in my local postfix? The presence of that header triggers the loop detection in postfix. The sender is adding that header either in a misguided attempt to improve delivery, or to intentionally cause a bounce to verify the address. > > Could it have anything to do with the always_bcc setting? No. The header is added by the sender. > Would some other MTA deliver the message anyway, or this simply a spam > harvesting tactic? The messages don’t seem to generate a valid bounce to a > valid address… Some MTAs behave the same as postfix eg. qmail. Some MTAs don't use Delivered-To: and ignore it eg. Exchange. We don't know the motive of the sender. We do know this isn't really a loop and it looks like spam to me. -- Noel Jones
