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Thread: [SOLVED] issue receiving mail - problem with name resolution

  1. #1
    mfehr is offline Senior Member
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    Default [SOLVED] issue receiving mail - problem with name resolution

    I created a fresh setup of Zimbra 5.0.5 on a fresh installed Ubuntu 6.06 behind an ipcop firewall.

    When receiving e-mails, the e-mail is received and virus checked fine. The next step the logfile shows is postfix/lmtp ... deferred ... connection refused. The reason is that the name resolution is done for the external IP address of my MX record.

    Tests I did to check the configuration:
    mail.xxx.com is configured in /etc/hosts as well as on the internal DNS server pointing to my internal IP address
    My mail MX record points to mail.xxx.com: host -x mx xxx.com confirms mail.xxx.com
    ping mail.xxx.com talks to my internal IP address
    /etc/resolv.conf shows my internal DNS as the first DNS

    Nevertheless the mail delivery catches the external IP address for my mail server rather the internal one. Any hints?
    Last edited by mfehr; 04-23-2008 at 11:38 PM.

  2. #2
    phoenix is offline Zimbra Consultant & Moderator
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    If you're behind a NAT router you need a Split DNS set-up and a correct /etc/hosts file. You need to post some information showing your DNS resolves OK & the hosts file is correct
    Last edited by phoenix; 04-24-2008 at 05:31 AM.
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    Bill Brock is offline Outstanding Member
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    When a mail client/server delivers to another mail server, it checks DNS for the MX record with the lowest serial number. Then it checks for the A record that resolves to the MX record.

    It is the delivering mail server which determines which IP to deliver to by the info it receives from it DNS querry. The receiving mail server can be made to listen on a specific IP but other than that it has nothing to do with which IP a sending server or client uses.

  4. #4
    mfehr is offline Senior Member
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    Default Solved

    Thanks. Installing and configuring bind9 on my zimbra host (ubuntu 6.06 server) solved the problem. Now zimbra got it's own dedicated DNS server.

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