The VPOP3 Header Processing options tell VPOP3 how to inspect and change message headers generally. This is not used for routing incoming POP3 messages (see Mail Collectors -> POP3 Routing).

➢Receipts/Urgent Messages - How VPOP3 inspects message headers to generate automated receipts, or to trigger an urgent connection

➢Global Header Modifiers - How VPOP3 changes the headers of outgoing messages