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When sending email using web UI (for example roundcube) and my relay is =127.0.0.1 I'm getting this error

host gmail-smtp-in.l.google.com[64.233.184.27] said: 550-5.7.1 [193.198.1.11 12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1

Excerpt from the /var/log/mail.log

Sep 14 21:28:06 mail postfix/qmgr[2915]: BB7418551: from=<xxxx@gkri.hr>, size=1082, nrcpt=1 (queue active)
Sep 14 21:28:07 mail amavis[2978]: (02978-01) Passed CLEAN {RelayedOpenRelay}, [193.198.1.11]:43798 [193.198.1.11] <xxxxxx@gkri.hr> -> <yyyyyyy@gmail.com>, Queue-ID: C953F422, Message-ID: <03227ea1376656afb567873be8981a60@gkri.hr>, mail_id: 15_o4VKBS9UP, Hits: -7.293, size: 700, queued_as: BB7418551, 3127 ms
Sep 14 21:28:07 mail postfix/smtp[3045]: C953F422: to=<yyyyyy@gmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.4, delays=0.17/0.05/0.04/3.1, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as BB7418551)
Sep 14 21:28:07 mail postfix/qmgr[2915]: C953F422: removed
Sep 14 21:28:07 mail postfix/smtpd[3021]: disconnect from mail.gkri.hr[193.198.1.11]
Sep 14 21:28:07 mail dovecot: imap(xxxxx@gkri.hr): Disconnected: Logged out in=605 out=520
Sep 14 21:28:07 mail postfix/smtpd[3004]: rewrite stream disconnect
Sep 14 21:28:07 mail postfix/smtp[3052]: BB7418551: to=<yyyyyy@gmail.com>, relay=gmail-smtp-in.l.google.com[64.233.184.27]:25, delay=0.73, delays=0.19/0.06/0.34/0.15, dsn=5.7.1, status=bounced (host gmail-smtp-in.l.google.com[64.233.184.27] said: 550-5.7.1 [193.198.1.11      12] Our system has detected that this message is 550-5.7.1 likely unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1 this message has been blocked. Please visit 550-5.7.1  https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for more information. qe3si5844139wjc.196 - gsmtp (in reply to end of DATA command))
Sep 14 21:28:07 mail postfix/cleanup[3043]: 954E88552: message-id=<xxxxx@mail.gkri.hr>
Sep 14 21:28:07 mail postfix/bounce[3053]: BB7418551: sender non-delivery notification: 954E88552

When sending from a e-mail client application (Android) I'm able to send my status is sent and no error is visible (e-mail goes right through)

status=sent 250 2.0.0 OK

Sep 14 21:37:04 mail postfix/qmgr[2915]: BE59C8551: from=<xxxxxxx@gkri.hr>, size=1893, nrcpt=1 (queue active)
Sep 14 21:37:04 mail postfix/smtpd[3179]: disconnect from localhost[127.0.0.1]
Sep 14 21:37:04 mail amavis[2978]: (02978-04) Passed CLEAN {RelayedOpenRelay}, [89.172.131.36]:56139 [89.172.131.36] <xxxxxx@gkri.hr> -> <yyyyyyy@gmail.com>, Queue-ID: 0C126422, mail_id: 0O_1VMAZ9_sa, Hits: -3.523, size: 1511, queued_as: BE59C8551, 1501 ms
Sep 14 21:37:04 mail postfix/smtp[3177]: 0C126422: to=<yyyyyy@gmail.com>, relay=127.0.0.1[127.0.0.1]:10024, delay=1.9, delays=0.36/0.04/0.01/1.5, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as BE59C8551)
Sep 14 21:37:04 mail postfix/qmgr[2915]: 0C126422: removed
Sep 14 21:37:05 mail postfix/smtp[3180]: BE59C8551: to=<yyyyyyy@gmail.com>, relay=gmail-smtp-in.l.google.com[74.125.71.26]:25, delay=0.62, delays=0.08/0.05/0.33/0.16, dsn=2.0.0, status=sent (250 2.0.0 OK 1473881825 tv2si5887390wjb.173 - gsmtp)

I have reverse DNS (ptr) set up as well as SPF.

Headers of the rejected mail

eporting-MTA: dns; mail.gkri.hr
X-Postfix-Queue-ID: 92014114E0
X-Postfix-Sender: rfc822; rene.brakus@gkri.hr
Arrival-Date: Thu, 15 Sep 2016 14:31:29 +0200 (CEST)

Final-Recipient: rfc822; rene.brakus@gmail.com
Original-Recipient: rfc822;rene.brakus@gmail.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; gmail-smtp-in.l.google.com
Diagnostic-Code: smtp; 550-5.7.1 [193.198.1.11      12] Our system has detected
    that this message is 550-5.7.1 likely unsolicited mail. To reduce the
    amount of spam sent to Gmail, 550-5.7.1 this message has been blocked.
    Please visit 550-5.7.1
    https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for
    more information. d5si660227wjm.249 - gsmtp

Return-Path: <rene.brakus@gkri.hr>
Received: from localhost (localhost [127.0.0.1])
    by mail.gkri.hr (Postfix) with ESMTP id 92014114E0
    for <rene.brakus@gmail.com>; Thu, 15 Sep 2016 14:31:29 +0200 (CEST)
Received: from mail.gkri.hr ([127.0.0.1])
    by localhost (mail.gkri.hr [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id hFJ_WfGPDrby for <rene.brakus@gmail.com>;
    Thu, 15 Sep 2016 14:31:28 +0200 (CEST)
Received: from mail.gkri.hr (mail.gkri.hr [193.198.1.11])
    by mail.gkri.hr (Postfix) with ESMTPA id DEF0F114AA
    for <rene.brakus@gmail.com>; Thu, 15 Sep 2016 14:31:27 +0200 (CEST)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
 format=flowed
Content-Transfer-Encoding: 8bit
Date: Thu, 15 Sep 2016 14:31:27 +0200
From: Rene Brakus <rene.brakus@gkri.hr>
To: <rene.brakus@gmail.com>
Subject: 87687686
Organization: =?UTF-8?Q?Gradska_knji=C5=BEnica_Rijeka?=
Message-ID: <63143a0aefe8e00c9d080433cfe50492@gkri.hr>
X-Sender: rene.brakus@gkri.hr
User-Agent: Roundcube Webmail/0.9-svn

Headers of the e-mail that went through 

Delivered-To: rene.brakus@gmail.com
Received: by 10.25.155.130 with SMTP id d124csp2856951lfe;
        Thu, 15 Sep 2016 01:09:06 -0700 (PDT)
X-Received: by 10.194.139.236 with SMTP id rb12mr6579607wjb.101.1473926946908;
        Thu, 15 Sep 2016 01:09:06 -0700 (PDT)
Return-Path: <rene.brakus@gkri.hr>
Received: from mail.gkri.hr (mail.gkri.hr. [193.198.1.11])
        by mx.google.com with ESMTP id t124si1544078wmt.5.2016.09.15.01.09.06
        for <rene.brakus@gmail.com>;
        Thu, 15 Sep 2016 01:09:06 -0700 (PDT)
Received-SPF: pass (google.com: best guess record for domain of rene.brakus@gkri.hr designates 193.198.1.11 as permitted sender) client-ip=193.198.1.11;
Authentication-Results: mx.google.com;
       spf=pass (google.com: best guess record for domain of rene.brakus@gkri.hr designates 193.198.1.11 as permitted sender) smtp.mailfrom=rene.brakus@gkri.hr
Message-Id: <57da5722.822d1c0a.c3e70.4b27SMTPIN_ADDED_MISSING@mx.google.com>
Received: from localhost (localhost [127.0.0.1]) by mail.gkri.hr (Postfix) with ESMTP id 63D741148C for <rene.brakus@gmail.com>; Thu, 15 Sep 2016 10:09:07 +0200 (CEST)
Received: from mail.gkri.hr ([127.0.0.1]) by localhost (mail.gkri.hr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id nTE8xSdhwfaS for <rene.brakus@gmail.com>; Thu, 15 Sep 2016 10:09:07 +0200 (CEST)
Received: from [192.168.88.209] (unknown [193.198.1.29]) by mail.gkri.hr (Postfix) with ESMTPA id 646EA11496 for <rene.brakus@gmail.com>; Thu, 15 Sep 2016 10:06:07 +0200 (CEST)
To: Rene <rene.brakus@gmail.com>
From: "rene.brakus@gkri.hr" <rene.brakus@gkri.hr>
Subject: Test
Date: Thu, 15 Sep 2016 10:06:06 +0200
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="----=_Part_0_1473926766295"

------=_Part_0_1473926766295
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: base64
Content-Disposition: inline

VGVzcgoK
------=_Part_0_1473926766295
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64
Content-Disposition: inline

PGRpdiBzdHlsZT0iZm9udC1mYW1pbHk6ICdDYWxpYnJpJywgJ3NhbnMtc2VyaWYnOyI+PGRpdiBk
aXI9Imx0ciI+VGVzcjwvZGl2PjwvZGl2Pjxicj4=
------=_Part_0_1473926766295--
Rene
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  • Your rejection error has a URL for more information. I'd start there. –  Sep 14 '16 at 20:12
  • yes it has information about unsolicited e-mails, we've had issues with spam injections but have resolved it 10 days ago, and we are not on any black lists for over 8 days. We weren't able to send e-mail to gmail using any client or UI, but in the last 12 hours we are able to send only using client apps – Rene Sep 14 '16 at 20:14
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    Possible duplicate of [How to send emails and avoid them being classified as spam?](http://serverfault.com/questions/48428/how-to-send-emails-and-avoid-them-being-classified-as-spam) – Jenny D Sep 15 '16 at 07:22
  • I wouldn't begin to guess, without seeing full headers and body of the rejected message. – Michael Hampton Sep 15 '16 at 07:46
  • @MichaelHampton I've added it in the question. – Rene Sep 15 '16 at 13:02

1 Answers1

0

Google's SMTP error reference

550, "5.7.1", Our system has detected that this message is likely unsolicited mail. To reduce the amount of spam sent to Gmail, this message has been blocked

Having this message in smtp log lead me to believe that I am on some sort of a blacklist from google. But after configuring mail and DNS server and setting up SPF, DKIM and reverse DNS (PTR), gmails smtp is no longer bouncing my e-mails.

The thing that confused me the most is why one e-mail account from the server was able to send to gmail. I later on concluded that this was because of me giving this e-mail when ask to be removed from the black list using this form

I hope my experience will help someone else too.

Rene
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