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Thread: Can't send external email

  1. #1
    bradley8424 is offline Member
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    Default Can't send external email

    I replaced my Cisco T1 router using the same configuration. I had to restart my router, running CentOS, which hadn't been restarted in a long long time. I think when I did this I lost some of the configuration. I'm trying to get everything back up and running. It seems like Zimbra can send/receive internal mail just fine. It can receive external mail. However, it cannot send any external mail. What configurations should I check on Zimbra and the router?

  2. #2
    uxbod's Avatar
    uxbod is offline Moderator
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    Welcome to the forums

    First thing it would be really helpful if you were to update your profile with the following output so we know which version of ZCS you are running
    Code:
    su - zimbra
    zmcontrol -v
    Have you tried telnetting to a remove SMTP server on port 25 to ensure that it is open ? Have you checked /var/log/zimbra.log to see why they are being deferred ? Are DNS lookups working okay ?

  3. #3
    phoenix is offline Zimbra Consultant & Moderator
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    Which release of Zimbra? Please update your form profile with the output of the following:

    Code:
    zmcontrol -v
    There's an option in the Admin UI to 'Enable DNS Lookup' that should be checked. Do you have a Split DNS set-up? Please post the output of the following commands (run on the Zimbra server):
    Code:
    cat /etc/hosts
    cat /etc/resolv.conf
    dig yourdomain.com mx
    dig yourdomain.com any
    host `hostname`  <-- type that exact command using backticks not single quotes
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

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    uxbod's Avatar
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    Ding dong Bill - we manage to do it again

  5. #5
    bradley8424 is offline Member
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    Quote Originally Posted by uxbod View Post
    Welcome to the forums

    First thing it would be really helpful if you were to update your profile with the following output so we know which version of ZCS you are running
    Code:
    su - zimbra
    zmcontrol -v
    Have you tried telnetting to a remove SMTP server on port 25 to ensure that it is open ? Have you checked /var/log/zimbra.log to see why they are being deferred ? Are DNS lookups working okay ?
    Release 4.5.0_RC2_566.DEBIAN3.1 DEBIAN3.1 FOSS edition

    I have successfully telnetted to a gmail smtp server. I don't think the /var/log/zimbra.log is working. How can I tell if DNS lookups are working OK? Which DNS lookups do you mean? I am able to ping google.com etc.

  6. #6
    bradley8424 is offline Member
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    Quote Originally Posted by phoenix View Post
    Which release of Zimbra? Please update your form profile with the output of the following:

    Code:
    zmcontrol -v
    There's an option in the Admin UI to 'Enable DNS Lookup' that should be checked. Do you have a Split DNS set-up? Please post the output of the following commands (run on the Zimbra server):
    Code:
    cat /etc/hosts
    cat /etc/resolv.conf
    dig yourdomain.com mx
    dig yourdomain.com any
    host `hostname`  <-- type that exact command using backticks not single quotes
    I get the same results with 'Enable DNS Lookup' checked and not checked. Split DNS is not set up.

    zimbra@zimbra:~$ cat /etc/hosts
    #10.0.1.4 zimbra.example.com zimbra
    127.0.0.1 localhost.localdomain localhost zimbra.example.com zimbra

    zimbra@zimbra:~$ cat /etc/resolv.conf
    # Generated by dhcpcd for interface eth0
    nameserver 10.0.1.254

    zimbra@zimbra:~$ dig example.com mx
    -su: dig: command not found

    zimbra@zimbra:~$ host `hostname`
    -su: host: command not found

  7. #7
    uxbod's Avatar
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    Your /etc/hosts is completely wrong! It should look like
    Code:
    127.0.0.1   localhost.localdomain   localhost
    ::1 localhost6.localdomain6 localhost6
    10.0.1.4   zimbra.example.com zimbra
    And as you are behind a firewall on a private IP you should be running a Wiki :: Split DNS architecture.

  8. #8
    bradley8424 is offline Member
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    Quote Originally Posted by uxbod View Post
    Your /etc/hosts is completely wrong! It should look like
    Code:
    127.0.0.1   localhost.localdomain   localhost
    ::1 localhost6.localdomain6 localhost6
    10.0.1.4   zimbra.example.com zimbra
    And as you are behind a firewall on a private IP you should be running a Wiki :: Split DNS architecture.
    What's really amazing is that everything was working just fine yesterday. I don't think Split DNS was ever set up because BIND is not installed on this machine at all.

  9. #9
    uxbod's Avatar
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    Check all your Wiki :: Log Files for any error messages.

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