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Thread: Stripping Content from Original Message to Avoid Backscatter Abuse

  1. #1
    DpsBob is offline Beginner Member
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    Default Stripping Content from Original Message to Avoid Backscatter Abuse

    Hello all!

    I am new to Zimbra administration because the old IT guy left and now I am doing my best to fill his shoes.
    The were big shoes! So any and all help is appreciated.

    As the title says, I am trying to configure Zimbra to remove the original message from 'bounced' emails that are sent to invalid addresses in our domain.

    We want to do this because we have become a backscattering target. We're fine with returning a notice that the target address was not found, but we DON'T want to return the original body - lest it be some nasty spam, which would turn us into nasty backscatterers!


    Here's a sample of the Zimbra log (/var/log/zimbra.log) for what happens when I send an email from my gmail account to an invalid account in our domain:


    Jun 14 12:57:54 mail postfix/smtpd[21436]: connect from mail-ea0-f169.google.com[209.85.215.169]
    Jun 14 12:57:54 mail postfix/smtpd[21436]: setting up TLS connection from mail-ea0-f169.google.com[209.85.215.169]
    Jun 14 12:57:54 mail postfix/smtpd[21436]: Anonymous TLS connection established from mail-ea0-f169.google.com[209.85.215.169]: TLSv1 with cipher RC4-SHA (128/128 bits)
    Jun 14 12:57:55 mail postfix/smtpd[21436]: NOQUEUE: reject: RCPT from mail-ea0-f169.google.com[209.85.215.169]: 550 5.1.1 <not-there@ourdomain.net>: Recipient address rejected: ourdomain.net; from=<myaddress/@gmail.com> to=<not-there@ourdomain.net> proto=ESMTP helo=<mail-ea0-f169.google.com>
    Jun 14 12:57:55 mail postfix/smtpd[21436]: disconnect from mail-ea0-f169.google.com[209.85.215.169]



    Thank you SO much in advance. I'm very thankful for these forums because I'm utterly lost at the moment - fingers crossed!

    Cheers
    - Bob

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Default

    +"backscatter +postfix - Yahoo! Search Results - search the forums and wiki for details on how reject all mail for non-existent recipients depending on your ZCS version (you've given no details of that).
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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