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Thread: Force TLS for outgoing SMTP

  1. #1
    Join Date
    Feb 2007
    Austin, TX
    Rep Power

    Default Force TLS for outgoing SMTP

    Which settings would I need to change to force both my users connecting to Zimbra as their SMTP AND Zimbra connecting to my outgoing gateway to use TLS for their SMTP transaction? I need to still allow incoming mail without encryption.

    To be clear I want to force the user to use TLS when sending mail. I have set the web mode to https only and I need to make sure that their desktop client HAS to use TLS and SMTP Authentication in order to get mail out.

    I also need to force Zimbra to use TLS when sending outbound mail to my edge MTA. This gateway has been set as my Web mail MTA Hostname and my Relay MTA for external delivery via the GUI.

    Peter LeBlond
    Product Development Engineer

  2. #2
    Join Date
    Nov 2006
    Rep Power


    This article may be of use to you :- Postfix TLS Support

    You can then set the Postfix options using :-
    su - zimbra
    postconf -e <variable_name>=<value>
    zmmtactl reload
    for these to be persistent across full ZCS reloads you can do :-
    su - zimbra
    zmlocalconfig -e postfix_<variable_name>=<value>
    Hope that is of some help.

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