How does Procmail work with SpamAssassin?
Customer-defined Procmail rules as specified in the “.procmailrc” file are applied after SpamAssassin has already evaluated a given message, which means that Graymail may have already trapped it before the Procmail rules are applied. If you have a Procmail recipe you would like to have applied before SpamAssassin evaluates your messages, place them in a file named “.procmailrc-first” instead of “.