This category is for filtering services only. Please submit sites that have mail client spam filters to Computers/Software/Internet/Clients/Mail/Windows/Tools/Spam_Filtering (or, if your filter is for a UNIX mail client, under the Computers/Software/Internet/Clients/Mail/UNIX hierarchy as appropriate). Mail server spam filters should go to Computers/Software/Internet/Servers/Mail/Spam_Filtering/

Sites that offer spam tracking services belong in Tracking/. Sites that offer tips on preventing spam (in some way that does not involve filtering e-mail) belong in Preventing. General spam sites belong in the parent category.