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Thread: undelivered emails

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  1. #1
    Join Date
    Sep 2006
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    Default undelivered emails

    We have seen an increasing traffic on our main mail server this week so we started checking some accounts and we found a HUGE amount of undelivered bounce emails to accounts that we don't know.

    Someone is spamming with emails from our domain, i know, but how do we fix this? We are getting around 100 undelivered emails every 5 minutes.

    Is there a way to decrease this?

    Thanks,

  2. #2
    Join Date
    Jul 2007
    Location
    Baltimore
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    Default

    I don't know if zimbra supports this, we use sophos puremessage as an e-mail gateway, but what you want to do is create a SPF record for your domain and silently drop any e-mails that fail the spf check.

  3. #3
    Join Date
    Sep 2006
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    Default

    nice! seems to be working! Thanks!!

  4. #4
    Join Date
    Sep 2006
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    Default

    No, same thing. Thanks though

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