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Thread: Outgoing spam

  1. #1
    Join Date
    Mar 2010
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    Default Outgoing spam

    Hello all,

    I've got a few abuse reports recently and while checking those reports it seems that someone is using my Zimbra (7 open source) installation to spam the world.

    I can't figure out how to prevent this as from the report all I can see is a few addresses (not mine). Example (I've replace my up with myip and my domain with mydomain.com):

    Return-Path: <gfrankpm@sns.nl>
    X-Original-To: prisma.gegenwart@kraftschlag.biz
    Received: from webmail.mydomain.com (webmail.mydomain.com [myip])
    by mx.dlcp.de (Spamtrap) with ESMTP
    for prisma.gegenwart@kraftschlag.biz; Mon, 04 Apr 2011 08:25:17 +0200 (CEST)
    Received: from localhost (localhost [127.0.0.1])
    by webmail.mydomain.com (Postfix) with ESMTP id AA8162103B73
    for <prisma.gegenwart@kraftschlag.biz>; Sun, 3 Apr 2011 20:35:13 +0300 (EEST)
    X-Virus-Scanned: amavisd-new at mydomain.com
    Received: from webmail.mydomain.com ([127.0.0.1])
    by localhost (webmail.mydomain.com [127.0.0.1]) (amavisd-new, port 10024)
    with ESMTP id 9I4ky1axFAvx for <prisma.gegenwart@kraftschlag.biz>;
    Sun, 3 Apr 2011 20:35:13 +0300 (EEST)
    Received: from Milkyway (accountancywales.plus.com [212.159.29.33])
    by webmail.mydomain.com (Postfix) with ESMTPA id 9AD2F20F6B82
    for <prisma.gegenwart@kraftschlag.biz>; Sun, 3 Apr 2011 19:05:58 +0300 (EEST)
    From: "Frank P M" <gfrankpm@sns.nl>
    Subject: Sehr dringend
    To: prisma.gegenwart@kraftschlag.biz
    MIME-Version: 1.0
    Reply-To: frankmp@gmx.com

    Any help is much appreciated.

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Default

    Have you checked to see if you have a compromised account on the server?
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
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    Default

    The output doesn't show any account with large number

    Thanks

    Quote Originally Posted by phoenix View Post
    Have you checked to see if you have a compromised account on the server?

  4. #4
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    Default

    But if I run the same command and use a domain that has nothing to do with me (the spammed domain) then I'm getting:

    cat /var/log/zimbra.log | sed -n "s/.*from=<\(.*\)@sns.nl>.*/\1/p" | uniq -c

    125138 gfrankpm

    but there is no such a user (gfrankpm) into my db.

    How can I prevent this from sending spams?

    Thanks in advance

  5. #5
    Join Date
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    Default

    Have you found it yet?
    I have had a similar problem, and it turned out to be a compromised account - a user responded to a phishing email and gave out their password...
    have you looked at your daily mail report (auto-sent to admin@yourdomain every night)? It will show who's account is sending out the emails...

    If it simply shows the emails come from "localhost", it probably means that the emails are originating from your web-client. Many times the perpetrator will alter the "from" field, to make it harder for you to figure out which user's account it is...

    In my case, they had dorked with the signature, so it was easy to confirm that I had found the account...

  6. #6
    Join Date
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    Default

    but then, what will you do to the account, is it simply close the account?

    Actually i have similar case "western union" spam currently infecting one of email account, so i would like to block any western union subject from that account to be sent out..how to do that ??
    Last edited by Saaidi; 06-25-2011 at 08:38 AM.
    A man under a table ....

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