>From: Matthias Apitz <g...@unixarea.de> >Sent: Saturday, November 21, 2015 9:15 AM >To: spamassassin-users >Subject: question re/ RDNS_NONE
>Hello, >I've sent myself an email which gets marked with RDNS_NONE. Can someone >please be so kind and explain to me which IP addr exactly triggers this >RDNS_NONE qualification? Thanks in advance. > matthias >----- Forwarded message from Matthias Apitz <g...@unixarea.de> ----- >X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on c720-r276659 >X-Spam-Level: * >X-Spam-Status: No, score=1.3 required=3.0 tests=RDNS_NONE autolearn=no > autolearn_force=no version=3.4.0 >X-Spam-Report: + > * 1.3 RDNS_NONE Delivered to internal network by a host with no rDNS >Received: from c720-r276659 (c720-r276659 [127.0.0.1]) > by localhost.unixarea.de (8.14.9/8.14.9) with ESMTP id tALF46JP002771 > for <guru@localhost>; Sat, 21 Nov 2015 16:04:06 +0100 (CET) > (envelope-from g...@unixarea.de) >Delivered-To: <w51246_0-g...@mb-19.1blu.de> >Received: from imap.1blu.de [178.254.4.77] > by c720-r276659 with IMAP (fetchmail-6.3.26) > for <guru@localhost> (single-drop); Sat, 21 Nov 2015 16:04:06 +0100 > (CET) >Received: from ms-10.1blu.de ([178.254.4.101]) > by mb-19.1blu.de (Dovecot) with LMTP id hf3FGWyHUFa9UgAAYCFinw > for <w51246_0-g...@mb-19.1blu.de>; Sat, 21 Nov 2015 16:03:00 +0100 >Received: from [93.104.16.254] (helo=localhost.unixarea.de) > by ms-10.1blu.de with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) > (Exim 4.76) > (envelope-from <g...@unixarea.de>) > id 1a09gq-0007RE-0t > for g...@unixarea.de; Sat, 21 Nov 2015 16:03:00 +0100 >Received: from localhost.my.domain (c720-r276659 [127.0.0.1]) > by localhost.unixarea.de (8.14.9/8.14.9) with ESMTP id tALF2wlq002757 > (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 > verify=NO) > for <g...@unixarea.de>; Sat, 21 Nov 2015 16:02:58 +0100 (CET) > (envelope-from g...@unixarea.de) >Received: (from guru@localhost) > by localhost.my.domain (8.14.9/8.14.9/Submit) id tALF2wpa002756 > for g...@unixarea.de; Sat, 21 Nov 2015 16:02:58 +0100 (CET) > (envelope-from g...@unixarea.de) Read the Received headers from the bottom up. Received: from [93.104.16.254] (helo=localhost.unixarea.de) This IP has a lot of issues and will always hit RDNS_NONE because there is no way to make the FCrDNS check pass to match the SMTP HELO of localhost.unixarea.de. It's also on a lot of RBLs so your outbound mail delivery is going to be very unreliable: http://multirbl.valli.org/lookup/93.104.16.254.html Research FCrDNS. It's like "caller ID" for mail servers to prove the sender is a legit mail server. Mail servers that talk directly to the Internet should be on a dedicated IP with a dedicated DNS entry so the A record and PTR records match the SMTP HELO. I guess you could make the FCrDNS work somewhat by setting the SMTP HELO to ppp-93-104-16-254.dynamic.mnet-online.de. It's still on a lot of RBLs. Dave
