hello. I think I have a dns issue that is causing emails to outlook customers to fail. when i send and email to an outlook hosted address, I get the following response:

This is the mail system at host mail.myserver.com.

####################################################################
# THIS IS A WARNING ONLY.  YOU DO NOT NEED TO RESEND YOUR MESSAGE. #
####################################################################

Your message could not be delivered for more than 4 hour(s).
It will be retried until it is 5 day(s) old.

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

<user@example.com>: Host or domain name not found. Name service error for
    name=example-com.mail.protection.outlook.com type=AAAA: Host not found,
    try again

I thought this was a simple DNS resolution issue, but I have done dig commands from both the host, and the acme container and they both pass with no issue. The host is not firewall’d

My network does not have ipv6 enabled, and ipv6 is fully disabled according to the mailcow documentation. The ipv6-nat container does not start.

I am running pihole, but have disabled it with no different results.

Happy to post whatever anyone needs to inspect, but I am out of places to look.

  • diekuh

    • Community Hero
    • volunteer
    Moolevel 110
  • Post #2

Post infos about your setup.

Also check all MTUs.

Please also post what exactly you changed to disable IPv6. Verify you really did what you post, please.

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    diekuh

    I’m not sure what to tell you other than i followed all the guidelines directly out of the mailcow documentation. these are the instructions I used for disabling ipv6

    Redirecting...

    mailcow.github.io
    Redirecting...

    otherwise this is a standard vanilla install that i haven’t player around with at all. I need to know specifically if you want to see certain logs or settings, because i have no idea where to look for anything that might resemble a smoking gun. after 6 months of this server and playing with it every few days, the only thing I have found is that the /var/spool/postfix/etc/resolve.conf does not exist.

      No one is typing