[posko]

I also am experiencing the same issue as the original poster. I've been receiving mail fine on my blackberry for months and just last night received a notification indicating a problem.
I think it may have something to do with the Small Business Yahoo mail account. I was able to get T-Mobile to sync with my regular *@yahoo.com account but not my *@mydomain.com.

I hear there's another thread related to this. I haven't found it yet.