Problem with spam and spoofed email addresses

I have a vexing problem with someone sending spam with fake "from" email addresses supposedly at my domain (i.e. ""). We have a mailserver, but we do not provide an open SMTP service, and checking the logs it's clear that they aren't actually being sent from our server. But my catch-all account is getting the hundreds of bounces that their spam is producing.

I'm concerned that this action might lead to my domain being blacklisted and the domain reputation tarnished by this spam.

Is this a real concern? Is there anything I can do about it? How do I know if my domain does end up blacklisted by an ISP? Is there any way to fight back against this insidious abuse?

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dr.nil wrote in news:

How ironic. You were just asking in alt.privacy.spyware about ways to beat popup blockers, and now you want someone to help YOU with SPAM.

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