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Thread: Mail server black listed in CBL

  1. #1
    Join Date
    May 2013
    Rep Power

    Default Mail server black listed in CBL


    I am learner in Zimbra. We have a Zimbra mail server (version zcs-8.0.2) placed behind the firewall, Today our mail server got blacklisted in CBL on further checking with I found we are blacklisted in nixspam it gave another one url it gave a sample spam mail header. As precautionary measure we had check all PC's in our network for virus and malware source using tools but found nothing. I am pasting below the header can any one help me what really happened and give me a fix.

    I had replaced my server name with and IP with x.x.x.x

    I had configured and to MTA RBL client

    Return-Path: <>
    X-Original-To: hexageplant@SPAMTRAP.INVALID
    Received: from ( [x.x.x.x])
    by (Spamtrap) with ESMTP
    for hexageplant@SPAMTRAP.INVALID; Tue, 19 Nov 2013 00:18:06 +0100 (CET)
    Received: from [] (port=38632 helo=[]) by x.x.x.x with asmtp id 1rqLaL-00026-00 for hexageplant@SPAMTRAP.INVALID; Tue, 19 Nov 2013 04:48:04 +0530
    Message-ID: <>
    Date: Tue, 19 Nov 2013 04:48:04 +0530
    From: "Australia Post" <>
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1
    MIME-Version: 1.0
    To: hexageplant@SPAMTRAP.INVALID
    Subject: Track Advice Notification: Consignment RYR7034588
    Content-Type: multipart/mixed;
    X-Spam: Not detected
    X-Mras: Ok

    Last edited by cnvivek; 11-19-2013 at 07:10 AM. Reason: to add more information

  2. #2
    Join Date
    Oct 2009
    Rep Power


    you have to check on mailq & zimbra stats which user that are spamming.

    once you have found which one, check that user's preferences for "reply to" setting (tempered reply to setting is usually a sign of compromised web mail account)

    enforce complex password.

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