[solved]E-mail Error

[theb2b]

When attempting to send an email from webmail I am getting this message;

Cannot send message: All Recipients are invalid

When I try to use Thunderbird I get

An error occurred while sending mail. The mail server responded:  4.3.0 <user@mydomain.com>: Temporary lookup failure. Please check the message recipient

Outlook also returns a similar response and it doesn't matter if its an internal mail address or an external address.

Preform a nslookup of mx record I get the following;
 broughtonhome.org
Server:         127.0.0.1
Address:        127.0.0.1#53

Same result for external look ups also. This why I am getting errors when attempting to send emails?

Thanks in advance for your help.