Re: Email notification not working
Unfortunately I have the same problem as the two of you. I am running fresh installations – newest WPMU and BP.
It was running all fine.
Now I (admin) get no email notifications at all – users do not receive any either. The activation emails are not being sent. The WPMU ones are not sent out either.
I am using a catch-all email on my email host to be able to sign up with different emails on the same domain.
First thing I was thinking was whether BP or WP was thinking all this signup from the same email domain was SPAM and therefore closing down signups from my IP or whatever.
I have searched for answers and found this: https://mu.wordpress.org/forums/topic/13039
Apparently some hosts do not allow automated emails to be sent out.
(However, if my host do not allow this, how come it worked fine for two weeks?)
Only plugin I have installed is the cets-blog-defaults. I have tried to deactivate it, but it does not help.
This is really frustrating 
