hehe, I had that too with my yahoo email. Fortunatly I switched to a different one now, wich I won't mention here
Maybe you can install those anti-spam programs (if they work, haven't tested yet) or contact the administrator of your server.
<a href="http://www.d2lodshop.com" target="blank">D2lodshop</a>
<a href="http://www.gatcity.com/forum/forumdisplay.php?f=3" target="blank">GAT City</a>
<a href="http://www.rhymbox.com" target="blank">XMPP instant messaging</a>