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Thread: Help with spam control

  1. #1
    klnasveschuk is offline Trained Alumni
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    Default Help with spam control

    I'm having a real problem with spammers sending to reciepients in our domain without an MX record. I want to enable reverse lookups to limit some of this. Here's some background on this:
    Currently running Network Edition 5.0.11 on Ubuntu 8.0.4 64bit
    We have a split domain with separate outgoing smtp server

    Each box that handles mail has an MX record in our DNS.

    I would like to continue to allow authenticated users to be able to send remotely through Zimbra.

    Will enabling DNS lookups in Global settings and for the server allow above?

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
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    What restrictions do you currently have in place ?
    Code:
    su - zimbra
    zmprov gcf zimbraMtaRestriction
    have you also had a read of Improving Anti-spam system - Zimbra :: Wiki.

  3. #3
    klnasveschuk is offline Trained Alumni
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    zimbra@mail:~$ zmprov gcf zimbraMtaRestriction
    zimbraMtaRestriction: reject_invalid_hostname
    zimbraMtaRestriction: reject_non_fqdn_sender

  4. #4
    uxbod's Avatar
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    Within the Admin GUI you should be able to enable reject_unknown_sender_domain which will do what you are after. I would also highly recommend that you implement some RBL checking aswell.

  5. #5
    klnasveschuk is offline Trained Alumni
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    Anyone using a rbldnsd with Zimbra?

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