[otrs] Dispatching by "to:" field

This may be a stupid question, but in the POP3 account management section, there's an option for "Dispatching by email To: field". What does this do? Every time I've selected it, tickets don't seem to show up anywhere, so I've been setting everything to dispatch by selected queue. It's a bit annoying, however, to have to create a new pop3 account for each queue. Am I missing something? Thanks in advance! Eric Murphy LTI Information Technology