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Thread: smtp authentication

  1. #1
    Korcillo is offline Intermediate Member
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    Default smtp authentication

    Hi, i canīt find how to authenticate users on port 25, several people have this issue with zimbra but i canīt find a solution, when i connect through telnet to my server, i can send mail without authentication and make pishing too. How can i solved this problem. Please help me. Imagine a user send an email pretending to be the manager and say that the day is free.

  2. #2
    Korcillo is offline Intermediate Member
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    Nobody??? I need help please!!!!

  3. #3
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Korcillo View Post
    Nobody??? I need help please!!!!
    It might help if you'd posted this in the correct forum instead of the Zimbra Desktop forum.

    Did you search the forums for an answer to this question (it has been answered before)? Your users should be using port 587 as the Submission port, that requires authentication.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  4. #4
    Korcillo is offline Intermediate Member
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    i solved the problem closing 25 with iptables and configuring 587 port in outlook but the phishing is there yet, i can put the mail address that i want.

  5. #5
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Korcillo View Post
    i solved the problem closing 25 with iptables and configuring 587 port in outlook but the phishing is there yet, i can put the mail address that i want.
    That's not phishing, it's called sending an email.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  6. #6
    Korcillo is offline Intermediate Member
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    Please, am not stupid. I refer to the mail from, for example, my address is: address@mail.com when I send a email throught outlook, in the mail from I can write the address I want, whatever@yahoo.whatever, I found this on the internet, but it doesn't work for me, this appears to be the solution to my problem.

    main.cf

    smtpd_restriction_classes = misremitentes
    misremitentes = check_sender_access hash:/etc/postfix/misremitentes, reject
    smtpd_sender_restrictions = check_client_access hash:/etc/postfix/misclientes

    /etc/postfix/misremitentes

    mydomain.com OK

    /etc/postfix/misclientes

    mydomain.com misremitentes

    The thing is how to adapt this to zimbra zmmta.cf
    I'm using zimbra 6.10
    Thanks.
    Last edited by Korcillo; 07-04-2011 at 08:40 AM.

  7. #7
    phoenix is offline Zimbra Consultant & Moderator
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    Quote Originally Posted by Korcillo View Post
    Please, am not stupid.
    Nobody said, or implied, that you were.

    Quote Originally Posted by Korcillo View Post
    I refer to the mail from, for example, my address is: address@mail.com when I send a email throught outlook, in the mail from I can write the address I want, whatever@yahoo.whatever, I found this on the internet, but it doesn't work for me, this appears to be the solution to my problem.
    Anyone that's on the Trusted Networks will be able to send an email through your server and it can contain any from address. You can either restrict them from connecting via the konsole or modify the Trusted Networks. The users should be connecting via port 587 and have to authenticate to get the ability to send email.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  8. #8
    Korcillo is offline Intermediate Member
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    That is the thing, I need to restrict them to send only from their address. How can i do that??

  9. #9
    Korcillo is offline Intermediate Member
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    i followed this guide RestrictPostfixSenders - Zimbra :: Wiki, hoping that works but nothing, realy i don't understand, am losing my fe on zimbra.

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