We have about 5 member/user levels on our site. We've set up Email Users and everything was working fine till this week. Now the plugin won't email to one of the groups. It acts like it's working, but no one receives the emails.
Sometimes we get this message:
"Email has been sent to $num_sent users, but 57 recipients were originally found. Perhaps some users don't have valid email addresses?"
Other times it just acts like it works...
What is strange is that is was working, and we can still email the other user groups. But, we can't email this one group. We can't even send individual emails to the members of this group.