subscribe2 looks like the solution that some of our readers want from our blog, but i can't seem to figure this out.
the "Mail Subscribers" function works fine (Recipients = registered users 58)
however, setting the "Recipients" to any of the subscribed categories results in the following (and at this point, there are only two subscribed users, one is myself as admin, and one is a contributer):
"Message failed! Check your settings and check with your hosting provider"
and new posts do not generate notifications.
any ideas on why this is happening??