[wellylug] Server acting as a mail relay

[Hong Chyr]

Hi all

I am experiencing a strange issue with a co-lo mail server. We are 
running Postfix on the server, and we have restricted the trusted domain 
to localhost.

mynetworks=127.0.0.1/8

We have also tested the server using open relay test sites such as 
http://www.abuse.net/relay.html. The result reported the server as not 
being an open relay.

However, we received some complains from our co-lo provider that some 
spam emails have been relayed from our server. How can I troubleshoot 
this problem?

Many thanks for your input.

Regards

Hong