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Thread: Force SMTP authentication

  1. #1
    resteves is offline Junior Member
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    Question Force SMTP authentication

    Hi,

    I would like to know how to force all clients to authenticate to send email through our zimbra server.

    I've already set the zimbraMtaMyNetworks to '127.0.0.0/8 10.0.0.2/32' but i still can send emails to my domain without authenticating, it only blocks sending to outside without authentication.

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by resteves View Post
    I would like to know how to force all clients to authenticate to send email through our zimbra server.
    Why do you want to do this? The correct port for mail submission is port 587, that requires authentication.

    Quote Originally Posted by resteves View Post
    I've already set the zimbraMtaMyNetworks to '127.0.0.0/8 10.0.0.2/32' but i still can send emails to my domain without authenticating, it only blocks sending to outside without authentication.
    That's correct, any IP on your LAN is in the Trusted Networks and therefore can send mail to any other user without authenticating - why is that a problem?

    I'll also move this thread to the correct forum as it's not a question about installing ZCS (which is where you posted).
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    resteves is offline Junior Member
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    Quote Originally Posted by phoenix View Post
    Why do you want to do this? The correct port for mail submission is port 587, that requires authentication.

    That's correct, any IP on your LAN is in the Trusted Networks and therefore can send mail to any other user without authenticating - why is that a problem?

    I'll also move this thread to the correct forum as it's not a question about installing ZCS (which is where you posted).
    This is a problem because someone can use the mail server to send email as if it was someone else, for example any user can send an email as if it was the president of the company.

    As you can see, i've setup my zimbraMtaMyNetworks with the loopback address and the ip address of the mail server only, but that doesn't help much

  4. #4
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by resteves View Post
    This is a problem because someone can use the mail server to send email as if it was someone else, for example any user can send an email as if it was the president of the company.
    Then just disable the persona feature in ZCS.

    In future don't add a 'me too' post to a thread that's six years old, I'll remove that post.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
    resteves is offline Junior Member
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    Quote Originally Posted by phoenix View Post
    Then just disable the persona feature in ZCS.
    Isn't that only for the Web Mail? "Allow sending email from any address" in the default COS right? I have that option disabled.

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