Don't expect miracles though. The Internet, despite the pseudo-moral actions of the USA Government and others, is still a free society and everyone can have their say. Just because you don't like somebody else's opinions doesn't give you the right to censor them. Experiment with your mail. The worst thing likely to happen is that it gets bounced back to you by your server because it couldn't find the address you gave.
Some people wonder what happens to all the lost mail.
You will be relieved to know that every message carries a little self destruct time bomb. If it doesn't find a home to go to, it either comes back to you or quietly dies somewhere out there in Internet world Back to the Internet page.