i've actually got rules set up to only forward email to me if it's sent directly to me or a few mailing lists
as for your question about what you can use if you can't use a BES - redirector isn't an option (it was made for Exchange only)
however, you can set up a BIS account and use mail connector or POP or IMAP access (if your IT enables this) - or iNotes if your carrier is still in BIS 1.8
in other words you have a lot of options
