I inherited my forum, and its been working fine - until today. Suddenly I don't get email notifications for new postings. It worked before just fine.
The email settings appear fine. The forum will send out emails directly - like if you email a forum member directly. It also sends out registration emails OK.
Any ideas on how to troubleshoot?

SInce registration emails work, I can't think of anything of hand that would stop the notifications

Check your spam folder. Your mail host may have changed a filter setting.