What to do with bounced emails?

Lately, I've been getting several notices from a great many ISPs about undeliverable email. It's pretty clear from cursorily examining the headers that my email address is being used to send spam, and many of these random addresses are bouncing back to me on account of, well, not existing. So far, the primary worry is the flooding of my mailbox with such bounces, but what happens if I get a notice/warning from my ISP or elsewhere (Spamcop, for eg) about such matters?

Is there any way of being proactive in this matter before that last thing happens? And if I do get a warning, what steps should I take to prove my innocence?

Apologies if this is not considered a security issue...sorry, but if there is a more appropriate forum to ask this question, I'd appreciate it if you could redirect me. Thanks very much in advance for all help and advice.

 

Can't get that link to work on either IE or FireBird.

If nothing else, he needs to make his ISP aware of the problem - ASAP - to head off possible action on their part if they mistakenly identify him as the spammer. Pete