Is there a way to make the POP server refuse porn spam? By using keywords or anything, the amount coimg through is annoying and it also annoys my users?

Perhaps there are scripts you can run at your RaQ who scan your mail messages , but it is not a standard feature of the Cobalt RaQ! :(

There are a few scripts available that can help blocking spam. Whether you can filter out the porn mail, or not, is a different matter. In the last few weeks I've noticed that a lot of them are using very banal language, so it would not be as easy as catching the X-rated language of yore.
Have a look at:
http://www.spambouncer.org/
http://www.uk2raq.com/raqfaq/raqfaqshow.php?faq=86
..http://www.perl.com/pub/a/2002/03/06/spam.html


There might be better solutions available, as some of the references there haven't been updated for a while