Manage mailing lists. Delete junk mail. Delete mail from given addresses. It was designed to be simple to use. Please keep this in mind as there exist other mail filters which are much more powerful but also harder to configure.
All rules react on information in the header.
Thus you cannot give actions for mails with specific data in the body, eg pgp signed or encrypted data, uuencoded data of GIFs and JPEGs. But this naturally required some knowledge on writing scripts. A filter rule is limited to 256 characters in length. Any characters above 256 will probably be ignored. Yes, this sucks.