Hi Mike,
Thanks for taking the time to have a look at my issue. I have contacted my hosting provider to see if anything has changed in the handling of mail.
Currently Email to single user, and groups, are both not working for me.
The only email function that appears to be working properly for us is the new user email that is generated and sent to users when a new account is created.
What should I be doing to troubleshoot this issue, outside of contacting my hosting provider.
Thanks again Mike!