Some sample recipies:
:0 Wh: msgid.log | formail -D 65536 /home/perry/.msgid.cache
:0: ^List-Post:.*<!\/[[A-Za-z0-9][[-A-Za-z0-9\.@]+ lists/$MATCH :0: ^Sender: owner-\/[A-Za-z0-9?[-A-Za-z0-9\.@?+ lists/$MATCH
:0:
lists/$MATCH
2 pages link to ProcmailNotes: