Depends what you mean by sync.
If all you want is to have the same INcoming mail on both machines, that's simple. Just set each machine's mail clients Account settings to leave mail on server for 10 days (or Delete mail from Server after 10 days, depending which mail program you use). Then just make sure you check mail on each machine not less than once every 10 days.
If you want to synchronize your Sent items, that's more difficult, unless you just BCC every sent mail to yourself and have a rule that puts mail from yourself into a Sent folder automatically.
If you want to actually sync all of your mail folders, then I don't know how to do that with a POP3 account.