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Thread: mail client outside the trust network

  1. #1
    54cc54 is offline New Member
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    Default mail client outside the trust network

    Dear Sir,

    I have installed Zimbra open source edition. I have tried :

    If I enable smtp authentication on my smtp client and pass authentication, the smtp client can send mail to users in local or non local domain even it is not in the trust network.

    If I disable smtp authentication on my smtp client and the smtp client outside the trust network, it cannot send mail to users in other domain, but can send mail to the users in local domain.

    How to configure Zimbra to restrict the smtp client not able to send mail to the users in local domain if it is not enable smtp authentication and not in the trust network?

    Best Regards,

    Jackson

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by 54cc54 View Post
    How to configure Zimbra to restrict the smtp client not able to send mail to the users in local domain if it is not enable smtp authentication and not in the trust network?
    First of all you should configure your clients to use the correct Submission port and that's port 587 and will require authentication. Second point, you can't stop external clients/servers sending mail to your local domain - that's what a mail server is for. Third point, you do not add a client IP address (other than your LAN subnet) to the Trusted Networks.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    leandropazc is offline Intermediate Member
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    How to prevent then that they can send mail to local accounts through my server except for authenticated users or the IP in postfix trusted network (zimbra server and ISP server)?

  4. #4
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by leandropazc View Post
    How to prevent then that they can send mail to local accounts through my server except for authenticated users or the IP in postfix trusted network (zimbra server and ISP server)?
    Did you read my reply above your post? You can't stop anyone sending mail to your local accounts (it doesn't make sense), if you do that they will not receive any email.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  5. #5
    leandropazc is offline Intermediate Member
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    That is, there is no way to prevent the following scenario:

    A user who is inside my network but not in my trusted networks connected via telnet port 25 or using a mail client, in MAIL FROM puts the mail of another person, mail account that is created in my domain, in order to replace his identity. On RCPT TO puts mail from another account, also from my domain. The mail is sent without asking for authentication and therefore the email is delivered with false information.

    This is so?

    In my case, I'm in a private network where the only way I get the emails is through my ISP. On my trusted network I only have the IP address of my Zimbra server and the IP address of the ISP.

    regards

  6. #6
    leandropazc is offline Intermediate Member
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    Anyone knows what could be done in my situation?

    regards
    Last edited by leandropazc; 04-07-2012 at 06:42 AM.

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