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My advice is worth 4 cents and it is this:
Put sendmail behind firewall and don't allow it to be accessed. Buy your domains from a company that gives you a free email account. Let them handle the smtp. Fucking sendmail/postfix - A: make no sense, and B: are too easy to use for nefarious reasons like spamming.
If you meant he is just using you email address in the "reply to" field, then it's the fault of the admin on the machines that run those servers for not blocking that shit. They are the ones that need to be blacklisted not you.
Getting back to your question, don't you already have several email addresses you can use? I have at 4 for doing different things.
If you are having problems submitting because the link lists don't recognize your new email, send them an email explaining the situation.
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