Is your BIS account getting spammed?
You may need to delete your account email address on your BIS (Calling your carrier may be required) and set up a new one. DON'T give that address out.
Instead, set up your ISP to forward your email to your newly created BIS address. Filter at the ISP level.
If your ISP doesn't offer a decent spam filter, try: Bluebottle :: spam free email
Their email service was created around preventing spam. Once you get an account there, forward all your messages to your BIS address.
The alternative is to POP from your ISP. Whatever you do, make sure the messages from your BB have a return smtp address of
and not email@example.com
If this doesn't make complete sense, just test a few configurations, but I wouldn't use your BIS account to give to folks.