Is it possible to allow (or add an option that allows) a filter to read email headers. This would be similar to the rules you can create in Outlook to search in the message header.
This is especially helpful to filter emails by IP addresses (for spam). . Also, catches spammers that use fake email address to hide their true emails as header filters can be directed to capture their true email domains in the header. Also can save having to create multiple filters for Subject, TO and From.