You've done all you can to avoid getting targeted. But you find that you are still getting spam mail. You should not be surprised.
No matter what we do to hide ourselves, if people are tenacious enough, they'll find out our e-mail address. This does not mean that defensive measures are useless. They are helpful but unfortunately, unless we change the whole philosophy on which the Internet is based, namely the idea that information should be kept decentralised and free, we cannot keep anything secret for long. (Oh the price we pay for freedom.)
We aren't helpless, however. ISP vendors, just like us, are pretty sick of spammers. In fact, most ISPs, if we clue them in on users who are abusing their accounts to send out spam mail, will terminate the offending persons' accounts.
Well then, that's easy, right? We just have to look at the spam mails FROM address and send the corresponding ISP help desk and complain, right? Unfortunately, it's not that easy. The spammers know they will lose their accounts if the victims rat on them. So they have ways of covering their tracks. But once again, we are no average netizen. We are webmasters and are therefore a wee bit smarter.
Interesting info, but when you say something like "You can visit their website for more details.", how about including a hyperlink to the URL, after all that's what the internet is all about!
The only way to stop spam is to have an authentication system like that used to sign ActiveX controls - that way senders of spam will be unable to get a "licence".