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Thread: Zimbra GA5.0.0 MTA can not send mail

  1. #1
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    Default Zimbra GA5.0.0 MTA can not send mail

    Hi, all!
    hic hic, my MTA server did not send mail to external domain. Although, it's can send local email, can receive mail from external mail.
    All messages send out, have the same problem "Connection time out". but i can test from this mta to external mta through port 25, it's ok.
    i think postfix server have problem.
    Anyone can help me to sovle this problem.

    thank you so much.

  2. #2
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    Default

    Do you have a firewall blocking port 25 outbound from your server?
    Does the DNS server that your Zimbra machine is using work properly (Respond with the MX of wherever you are trying to send mail to)?
    Could you post a line from your log file showing the exact error?

  3. #3
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    The postfix of zimbra did not find Mx record of domain to send email. How to solve this problem.

    thanks all

  4. #4
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    Please run
    Code:
    dig +short google.com MX
    on your email server. You should get output like:
    Code:
    10 smtp3.google.com.
    10 smtp4.google.com.
    10 smtp1.google.com.
    10 smtp2.google.com.
    If you do not then something is wrong with the DNS server that you have set your email server to use. If however you do get a response like that then your problem is not that your email server can't find the MX record of a domain to send the email to. I still would like to see whatever line of the logfile you are seeing that tells you that your server can't find the MX record. Are you only having this issue on a single domain you are trying to send to or are all domains having this issue?

    If you are only having this issue with a single domain try running some queries on your email server like the following:
    This should show what your email server sees as the MX record for domain.tld:
    Code:
    dig +short domain.tld MX
    If that returns a result then do:
    Code:
    dig +short server.domain.tld
    using the answer you got in the previos query. This will return what address your mail server thinks it should connect to. Make sure that your email server is able to connect to it (Possibly it is getting an internal IP address when it shouldn't?)

    Hopefully this will help you.

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