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I am trying to stop spam from one sender. They each time uses another mail server. here is headers from original email (i replaced my email and host with: my-email@my-domain.com, sender email and host i replaced with: sender-email@sender-website.com, all other is unchanged):

From - Mon Jan 27 14:17:08 2014
X-Account-Key: account7
X-UIDL: 1201266183.11294
X-Mozilla-Status: 0001
X-Mozilla-Status2: 00000000
Return-Path: <4a590193769-1-589@delivery-gate.com>
Received: from my-domain.com ([unix socket])
     by localhost (Cyrus v2.2.13-Debian-2.2.13-10) with LMTPA;
     Mon, 27 Jan 2014 14:15:18 +0200
X-Sieve: CMU Sieve 2.2
X-Greylist: delayed 460 seconds by postgrey-1.27 at mnl-bck; Mon, 27 Jan 2014 14:15:05 EET
Received: from gw13.delivery-gate.com (gw13.delivery-gate.com [])
    by my-domain.com (ESMTP daemon) with ESMTP id 999EA15F505
    for <my-email@my-domain.com>; Mon, 27 Jan 2014 14:15:05 +0200 (EET)
MIME-Version: 1.0
From: Blah blah blah <sender-email@sender-website.com>
To: my-email@my-domain.com
X-Original-To: my-email@my-domain.com
Reply-To: Blah blah blah <sender-email@sender-website.com>
Subject: {(***Disarmed***)} =?UTF-8?B?VmFsZW50xKtuYSBkaWVuYSBuxIFrIQ==?=
Date: Mon, 27 Jan 2014 12:07:07 +0000
DKIM-Signature: v=1; a=rsa-sha1; q=dns/txt; l=6092; s=default;
    t=1390824427; c=relaxed/simple;
    z=From:=20Blah blah blah=20<sender-email@sender-website.com>
Content-Type: multipart/alternative;
Message-Id: <20140127120707.1874C2C0E5614@gw13.delivery-gate.com>
X-my-domain.com-MailScanner: Found to be clean
X-my-domain.com-MailScanner-SpamScore:  2.77
X-my-domain.com-MailScanner-From: 4a590193769-1-589@delivery-gate.com
X-MailScanner-Envelope-To: my-email@my-domain.com

Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="UTF-8"

I edited /etc/postfix/sender_access to reject email from sender-website.com. But that does not work, because postfix is seeing that email comes from different sender/server. From postfix log file:

Jan 27 14:15:05 myMailServer postfix/smtpd[12822]: connect from gw13.delivery-gate.com[]
Jan 27 14:15:05 myMailServer postgrey[4304]: delayed 460 seconds: client=gw13.delivery-gate.com, from=4a590193769-#-#@delivery-gate.com, to=my-email@my-domain.com
Jan 27 14:15:05 myMailServer postfix/policy-spf[12827]: : testing: stripped sender=4a590193769@delivery-gate.com, stripped rcpt=my-email@my-domain.com
Jan 27 14:15:05 myMailServer postfix/policy-spf[12827]: : SPF pass: smtp_comment=Please see http://www.openspf.org/why.html?sender=4a590193769-1-589%40delivery-gate.com&ip= contains, header_comment=myMailServer: domain of 4a590193769-1-589@delivery-gate.comdesignates as permitted sender
Jan 27 14:15:05 myMailServer postfix/policy-spf[12827]: decided action=DUNNO
Jan 27 14:15:05 myMailServer postfix/smtpd[12822]: 999EA15F505: client=gw13.delivery-gate.com[]
Jan 27 14:15:05 myMailServer postfix/cleanup[12829]: 999EA15F505: hold: header Received: from gw13.delivery-gate.com (gw13.delivery-gate.com [])??by my-domain.com (ESMTP daemon) with ESMTP id 999EA15F505??for <my-email@my-domain.com>; Mon, 27 Jan 2014 14:15:05 +0200 (EET) from gw13.delivery-gate.com[]; from=<4a590193769-1-589@delivery-gate.com> to=<my-email@my-domain.com> proto=ESMTP helo=<gw13.delivery-gate.com>
Jan 27 14:15:05 myMailServer postfix/cleanup[12829]: 999EA15F505: message-id=<20140127120707.1874C2C0E5614@gw13.delivery-gate.com>
Jan 27 14:15:05 myMailServer postfix/smtpd[12822]: disconnect from gw13.delivery-gate.com[]

So, when i am looking message source in thunderbird, i see header: From: Blah blah blah <sender-email@sender-website.com>. How i can block email from that sender (sender-website.com)? There is no point to block IP, because next time it will different. I have also set up MailScanner, but that too does not see proper from header. I already blacklisted that domain in MailScanner too.

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1 Answer 1

up vote 2 down vote accepted

So you have added sender-email@sender-website.com REJECT to your sender_access file, have you added hash:/etc/postfix/sender_access to your smtpd_recipient_restrictions = as the first option?

You may also have more luck using the smtp_nested_header_checks option as well, as it allows you to examine any Non-MIME header for identifiers.

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yes, yes and yes. For other rules it works. Postfix just does not see correct sender from. smtpd_recipient_restrictions = hash:/etc/postfix/access, check_sender_access hash:/etc/postfix/sender_access, permit_sasl_authenticated,... –  Guntis Jan 27 at 13:02
Can you show the lines in /var/log/maillog where this email is arriving? It should show the From email that postfix is seeing.. –  NickW Jan 27 at 13:07
see my question –  Guntis Jan 27 at 13:22
maybe you could just add that email to your spamassassin blacklist, give it 10 points off the bat.. –  NickW Jan 27 at 13:24
I was looking, you might be able to catch this guy with smtp_nested_header_checks as well, it's worth looking into at the very least.. –  NickW Jan 27 at 13:48

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