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Thread: Zimbra as primary - do the forwarded mails go through antispam?

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  1. #1
    Join Date
    May 2007
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    Default Zimbra as primary - do the forwarded mails go through antispam?

    Hello, we are currently using Zimbra as a secondary mail server, for testing and making a smooth migration, moving one user at a time from Exchange to Zimbra. Our online antispam service will expire soon though (we are using blackspider), and we don't want to renew it as it is quite expensive - so we would like to use Zimbra's antispam feature.

    So we want to put Zimbra as primary, and our Exchange server as secondary; that way Zimbra could filter the spam before it get delivered to exchange.

    So here is my question: does Zimbra filters spam on mails to mailboxes it is supposed to forward to?

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    Sep 2005
    Vannes, France
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    Zimbra filters anything that hits port 25 before it gets delivered or forwarded.


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
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    May 2007
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    Thumbs up

    Hello, thanks for your answer

  4. #4
    Join Date
    Jul 2007
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    Default secondary

    If by secondary, you mean a different MX priority in DNS, be careful. A lot of spammers target the backup mail servers because there is a greater chance of less spam filtering.

    In the past, I have seen places which have their primary with the spam filter, and a secondary without spam filtering blocked by the firewall. In the event of an emergency, where the primary had failed, the secondary firewall rule would be removed.


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