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Thread: Multi-server Installation: SMTP host and MTA Auth host

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  1. #1
    Join Date
    May 2012
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    Default Multi-server Installation: SMTP host and MTA Auth host

    Hello guys,

    I am a little confused about the configuration of "SMTP host" when I am installing a Zimbra mailbox server and "MTA Auth host" when I am installing a Zimbra MTA Server with a multi-server setup environment.

    Installing a Zimbra mailbox server:
    2) zimbra-store: Enabled
    ... ...
    ******* +SMTP host: UNSET

    Installing a Zimbra MTA Server:

    3) zimbra-mta: Enabled
    +MTA Auth host: UNSET

    I have multiple mailbox servers and MTA servers and originally I believe they have a "multi to multi" relationship. For an incoming message, MTA gets the "ZimbraMailHost" from LDAP during the authentication and routes the inbound message to the corresponding mailbox server which hosts the mailbox for that account.

    Anyone please clarify:

    1, What are "SMTP host" and "MTA Auth host" used for?
    2, How should I configure them with a multi-server installtion?

    For "MTA Auth host", regarding to the guide, it is said "MTA Auth host. This is configured automatically if the MTA authentication server host is on the same server, but must be configured if the authentication server is not on the MTA. The MTA Auth host must be one of the mailbox servers."

    Also a thread said "Previously, it assumed that the auth host was the localhost - which caused problems during multi-host installs. So, the answer to how it worked before was "poorly". " (

    Sorry I am not quite clear with these answers and could anyone please clarify more precisely? Thank you.

  2. #2
    Join Date
    May 2007
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    MTA Auth Post is your Zimbra server that provide LDAP functionality for account authentication. This is an LDAP Server or simply a mailbox server (if you set LDAP function on mailbox server). SMTP host is your MTA server, the server which will be act as mail transport server.
    Best Regards
    Masim "Vavai" Sugianto
    Zimbra Tutorial
    Personal Blog [ID]

    Release 8.0.6_GA_5922.SLES11_64_20131203103702 SLES11_64 FOSS edition.

  3. #3
    Join Date
    May 2012
    Rep Power


    Hello vavai, thanks for your reply.

    Is it possible for me to configure multiple "MTA Auth Host" for one MTA host? and mutilple "SMTP host" for the zimbra mail server? How to?

    Because I think one mailbox server should have multiple MTA server serve for it, not only one configured, and vice versa.

    From the doc it is said your can use zmlocalconfig -e ldap_url="ldap:// ldap://" to configure which ldap servers you will use.

  4. #4
    Join Date
    Jun 2012
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    thanks, i've done with your way. one time working.

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