Linux Email Problem

[bradlea7]

Using Postfix I am trying to send external mails from a linux box and getting below error in mail log.

to=<address@gmail.com
>, relay=none, delay=10, status=deferred (Host or domain name not found. Name se
rvice error for name=host.mail.abc type=MX: Host not found, try again)

Anyone any uselful commands to verify what exactly is wrong, what is a name servive error?

[iwanabeguru]

For sending mail through your own mail server you need to identify your server.
Probably you are using names instead of ip adresses.
But in this case you need to add an MX record your network DNS server configuration which points to your mail server, and you must configure an A record for the address of the mail server.