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Thread: [SOLVED] Inbound external mail, STARTTLS offered?

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  1. #1
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    Question [SOLVED] Inbound external mail, STARTTLS offered?

    Hi everyone

    Been using Zimbra for a while now, but been checking it out for a few years. Happy with it so far but we're only a small installation of 14 accounts.

    Since Zimbra seems to support SSL/TLS on all aspects of its services I thought I'd start looking to see if there was a way to ensure security on the inbound mail channel, port 25.
    I thought there might be some sort of protocol like SMTPS but it appears that Postfix supports the STARTTLS command.

    Is this supported in Zimbra by default?

    I realise this isn't e-mail encryption in the PGP sense, but it would be cool to know there's an encrypted channel there if an external MTA asks for it.

    For example an external MTA is configured to offer TLS to the receiving SMTP server, eg: Zimbra.
    Does Zimbra accept incoming STARTTLS requests?

    Cheers, B
    My Zimbra Bugs Wishlist: 16411, 24567, 35676, 36430, 37770, 41872, 43733, 44384, 46383, 47759
    And a way to associate mailto: handlers with a Zimbra Prism webapp

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    Quote Originally Posted by batfastad View Post

    Is this supported in Zimbra by default?
    Yes,

    I use it on my home Zimbra server.

    Doug
    Ben Franklin quote:

    "Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."

  3. #3
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    Awesome

    So Zimbra just accepts those connections without any fuss?
    I don't need to do any extra configuration or anything?

    Cheers, B
    My Zimbra Bugs Wishlist: 16411, 24567, 35676, 36430, 37770, 41872, 43733, 44384, 46383, 47759
    And a way to associate mailto: handlers with a Zimbra Prism webapp

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    Quote Originally Posted by batfastad View Post
    I don't need to do any extra configuration or anything?
    If you can do a:

    telnet yoursever.com 25
    ehlo yourserver.com

    And get a response that has

    250-STARTTLS

    Then you're good to go.

    Doug
    Ben Franklin quote:

    "Those who would give up Essential Liberty to purchase a little Temporary Safety, deserve neither Liberty nor Safety."

  5. #5
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    Yep I see that in the telnet reply.
    Good stuff!

    Cheers for the info

    B
    My Zimbra Bugs Wishlist: 16411, 24567, 35676, 36430, 37770, 41872, 43733, 44384, 46383, 47759
    And a way to associate mailto: handlers with a Zimbra Prism webapp

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