i have problems with emails sending out to outside people.
example: firstname.lastname@example.org sends mail
peter receives the email but david receives it hours or probably days later.
when i do a postqueue -p this is what i get
7DC0856D01CE 23208 Mon Jun 2 10:29:24 email@example.com
(Host or domain name not found. Name service error for name=notmydomain.com type=MX: Host not found, try again)
i believe it has something to do with the MX records but i cant find any solutions in the internet for it.
i am currently using zimbra version 4.0.5
the mail server also has its own DNS
and i end up having 200 over mails stuck in deferred queue.