Fuzzy
You could login to yahoogroups (http://groups.yahoo.com/mygroups) and click
on "My Email Preferences", then "Show History" to get an idea of what's been
going on. It should show the most recent bounce error message, which might
give you some idea what's happening. It's not much, but it's a start.
Also ask a friend to send you an email and see what they get back when it
bounces.
Andy