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Spam relaying via Plesk postix Mail Server

Discussion in 'Plesk 9.x for Linux Issues, Fixes, How-To' started by PaddingtonC, Aug 31, 2012.

  1. PaddingtonC

    PaddingtonC Basic Pleskian

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    I have a Plesk 9.5 mail server on Ubuntu 8.04 LTS which forwards all SMTP traffic to an anti-spam server cacti.snowbarre.co.za. Many times I see the headers on the anti-spam server to contain from addresses not hosted on the mail server and I have checked and confirmed that my server is not an open relay server. How can a spammer be using my server to relay spam traffic? How can I stop this?

    Open relay test:
    paddington@paddington-MS-7387:~$ telnet cm 25
    Trying 196.201.x.x...
    Connected to cm.
    Escape character is '^]'.
    220 cm.snowbarre.co.za ESMTP Postfix (Ubuntu)
    mail from:test@facebook.com
    250 2.1.0 Ok
    rcpt:paddington@yahoo.co.uk
    221 2.7.0 Error: I can break rules, too. Goodbye.
    Connection closed by foreign host.
    paddington@paddington-MS-7387:~$


    A typical headers is:
    View basic headers
    Received from cm.snowbarre.co.za (cm.snowbarre.co.za[196.201.x.x]) by cacti.snowbarre.co.za (Postfix) with ESMTPS id 00B601881AD; Mon, 27 Aug 2012 14:03:29 +0200 (SAST)
    Received from cm.snowbarre.co.za (localhost [127.0.0.1]) by cm.snowbarre.co.za (Postfix) with ESMTP id 81627367E007; Mon, 27 Aug 2012 14:02:50 +0200 (SAST)
    Received from User (ml82.128.x.x.multilinksg.com [82.128.x.x]) by cm.snowbarre.co.za (Postfix) with ESMTP; Mon, 27 Aug 2012 14:02:49 +0200 (SAST)
    Reply-To <amsnkeuri@ymail.com>
    From "Ms Nkeuri Aguiyi"<admin@jogor.net>
    Subject Your Unpaid Fund.
    Date Mon, 27 Aug 2012 05:03:22 -0700
    MIME-Version 1.0
    Content-Type text/html; charset="Windows-1251"
    Content-Transfer-Encoding 7bit
    X-Priority 3
    X-MSMail-Priority Normal
    X-Mailer Microsoft Outlook Express 6.00.2600.0000
    X-MimeOLE Produced By Microsoft MimeOLE V6.00.2600.0000
    X-Antivirus avast! (VPS 120821-0, 08/21/2012), Outbound message
    X-Antivirus-Status Clean
    Message-Id <20120827120250.81627367E007@cm.snowbarre.co.za>
    To undisclosed-recipients:;
     
    Last edited: Aug 31, 2012
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