[rebelde]

My experience is that Gmail and Yahoo just send your emails to the Spam folder and don't bother sending any sort of notification. Of course, different email providers can do different things, but this isn't a problem that I have run across.

If it did happen, fixing it is a simple as running the right UPDATE on the table.

UPDATE beh_users SET deliverflag = 0 WHERE email like '%@gmail.com';

Or something like that.