Someone is faking my email address and sending out spam which appears to be coming from my business email.  My emails to hotmail and msn  usersare now being blocked as follows:

This is a system generated message. Please DO NOT REPLY.

Your message was not delivered for the following reason:

Your message was not delivered because the return address was refused.

The return address was "<*** Email address is removed for privacy ***>"

Kind regards.

The Xtra Messaging Team