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Thread: How to enable sending to A record if MX record not found?

  1. #1
    maxchowhk is offline Junior Member
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    Default How to enable sending to A record if MX record not found?

    I think is it native for Postfix but after upgraded to ZCS 7.0, seems the all mails returned when sending to a Domain without MX record.

    Please advice clearly. I have go though a lot of forums and still got no exact answer.

    Thanks

  2. #2
    phoenix is online now Zimbra Consultant & Moderator
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    Quote Originally Posted by maxchowhk View Post
    I think is it native for Postfix but after upgraded to ZCS 7.0, seems the all mails returned when sending to a Domain without MX record.

    Please advice clearly. I have go though a lot of forums and still got no exact answer.
    The answer would be that a domain needs an MX record (pointing to an A record) for the mail to get delivered. Which domain is it that doesn't have an MX record, one of yours or another mail server?
    Regards


    Bill


    Acompli: A new adventure for Co-Founder KevinH.

  3. #3
    maxchowhk is offline Junior Member
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    There is quite a few of my client using a single server as host and email, according to some other threads in other forum, the Postfix should try the A record host if the MX record is not found for a domain. I believe I need my Zimbra work in this behavior, so looking for help.

  4. #4
    maxchowhk is offline Junior Member
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    Hi Bill,

    and you know, users are idiots, they keep asking why can do the same with hotmail but not our own server. I need this to be done.

  5. #5
    maxchowhk is offline Junior Member
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    Can anyone please help?

  6. #6
    cpm
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    Would be good to have some more information.

    yes, Postfix *should* try the A record for 'the domain' (IE, everything to the right of the '@') *if* there is no relevant MX record.

    What -exactly- is going on? what domain is failing?

    What do the logs show?

    Are you getting rejected, or bounced?

    Need more information.

  7. #7
    Himanshu is offline Advanced Member
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    Quote Originally Posted by maxchowhk View Post
    There is quite a few of my client using a single server as host and email, according to some other threads in other forum, the Postfix should try the A record host if the MX record is not found for a domain. I believe I need my Zimbra work in this behavior, so looking for help.
    1.Does the mail return back to sender or Remains in mail queue for some days and then return
    2.Does MTA Check for DNS in Server Settings and the same in Global Setting ?
    3.How Does Zimbra Server resolve Names ? Does the server has DNS (Bind) Installed and configured properly ?

  8. #8
    maxchowhk is offline Junior Member
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    Hi Himan,

    Yes, the system returned the following mail

    --------------------------------------------------------

    This is the mail system at host mx.marveldigital.com.

    I'm sorry to have to inform you that your message could not
    be delivered to one or more recipients. It's attached below.

    For further assistance, please send mail to postmaster.

    If you do so, please include this problem report. You can
    delete your own text from the attached returned message.

    The mail system

    <xxxxxxx@aspa.it>: Host or domain name not found. Name service error for
    name=aspa.it type=MX: Host not found, try again

    ----------------------------------------------------------

    And I learn from other forum that Posfix only try to send to A record under certain condition but I cannot get a overall summary to check with.
    I have firewall in front of the zimbra and the DNS is pointed to the firewall, nslookup do resolve domains.

    Can you give me some detail of how to check if everything required is ok?

    Thanks

  9. #9
    cpm
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    well,

    The machine at the A record for domain aspa.it doesn't have anything listening on the SMTP port, so
    it would fail anyway.

  10. #10
    maxchowhk is offline Junior Member
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    eh.... This is just one of those. But how can I check whether my Zimbra does try sending to the A record?

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