I've noticed that my main Yahoo Mail address has just recently begun receiving about 200 spam messages a day. Fortunately, the Yahoo spam filter gets it all.
What disturbs me is that I created an e-mail address for my TCH account and immediately began receiving spam. And I don't see how the crude Horde or SquirrelMail filters can be configured to stop it.
Note: I've enabled SpamAssassin, and while I have no idea how it interfaces with either of the two available e-mail programs, I'll see what happens with it.