One might say that the site's owner is harrassing you; he might be spamming you (which might be illegal); he might be abusing your copyright by reprinting the e-mail. He definately is a massive jerk.
Limiting the damage may seem like it's good for you, but he'll end up "winning", because you gave up; he's probably getting a stiffy by doing that. He'll also be going on to annoy other people this way.
If you manage to get his home address, there's tons of non-violent things you can do to ruin his life. Sign him on for junk mail, putting up his name and details in a "looking for gay S&M sex" ad, and other such things.
If you cannot get the details, at least you have his e-mail addy, which can be used in various get-back schemes. A similar "mail the asshole" site, or a round of sign-me-up-for-gay-midget-S&M-porn-spam might annoy him a lot.
(Note: I have nothing against gay S&M porn, nor midgets performing in such acts. It's just an example.
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