simple mail sorter

 Sortmail is a simple mail sorter you can use in your .forward to sort
 your mail into folders automatically, delete unwanted mail, etc.
 .
 Sortmail process incoming email, classify it, and process it accordingly.
 Sortmail can handle incoming email as it arrives, or download from a POP
 server. Sortmail is easier to configure than procmail, and can replace
 fetchmail. Sortmail uses config files which are similar to rn KILLfiles.
 .
 Full features list:
   - Process email delivered via SMPT, or downloaded via POP or IMAP.
   - Post-process an existing mail folder.
   - Select messages based on specific header lines, based on the entire
     header, or even the message body.
   - File messages to folders, send to inbox, forward to other email
     addresses, append to digest, pipe through shell command or just junk
     them.
   - Regular expression matching or IP address range matching.
   - Full boolean expressions of any complexity.
   - Basic mailing-list processing functionality.