Bloody B******s

Well, it seems like someone is using my domain name as the from address when they are sending spam as I keep getting all these 'undeliverable mail' messages from people who I don't know and the message attached is always spam. I am sure that a good number of spam messages are actually gettuing through to people and they think I am sending them spam, which is really annoying. I don't know how to combat this, as far as I know there is no way to stop people using any 'return to' address they like on their e-mail.

Does anybody have any ideas how I can stop this?

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