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Thread: Testing Zimbra with same domain as production email server.

  1. #1
    Join Date
    Oct 2008
    San Diego
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    Default Testing Zimbra with same domain as production email server.

    I would like to test a zimbra server using the same domain as my current production email system and maybe eventually migrate all my users to it over time. I have an "Idea" but I don't know for sure if it will work or if there is a better way.

    The mx for my domain(We will call it points to the host of our anti-spam/virus gateway appliance. It sends mail to our actual internal SMTP/IMAP/POP production server.

    I will setup the zimbra server to have the same and second domain for the old system to forward too. I would setup an mx record to point to the new zimbra server. Accounts on the zimbra server will be setup under with an alias to When I want email from to be delivered to the new zimbra server I would put a forward on the old email system for to point to Assuming this will work am I correct that the to field will retain the address? Another What about email sent from the zimbra server to users that have not been migrated yet. Will the Zimbra server look up the mx and send an email destined for to the gateway device or will it reject the mail because it doesn't have a on the system? Is there a much better way to do all this?

    Last edited by millerdc; 10-02-2008 at 12:31 PM.

  2. #2
    Join Date
    Aug 2008
    St Pete FL USA
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    There is a better way, yes, but I'm not done writing it up for the Wiki (which is mostly because I'm still *implementing* it. :-)

    But yes, it involves lots of forwarding to avoid a splash-cut.
    Jay R. Ashworth - ZCS 6.0.9CE/CentOS5 - St Pete FL US - Music - Blog - Photography - IANAL - IAAMA
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  3. #3
    Join Date
    Aug 2007
    outside Philadelphia
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    We were in the same setup, roughly, where all mail goes through our av/spam gateway. Using postfix "transports", I distinguished any user that was on Zimbra, and had mail for them go there. All other mail (meaning, if a user/email address was not specified) would go to our legacy/main email server.

    On Zimbra, you configure a setting (forget which, but it is in the wiki) to say "if the address used is the same domain but not on here, forward to this server", which was our spam/av gateway, who would then forward over to our other/main email server

    on legacy mailserver, if they didn't exist on there, it would get forwardeded to spam/av gateway, which would then relay to Zimbra. It was not bad for a gradual (3 week) migration, and again, this was only about 100 or so people. Is it workable in a larger scale? Yeeessss.... but YMMV.

    PM me if you need more specific details, but it is completely workable and functions just fine.

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