No Subject" and This message has no content.

Please Help! :(

No Subject" email  meaning someone just Join the site or a member send a greeting to another member or left a comment.  to reproduce the No Subject issue.. all you have to do is create an account at site, like someone photo, leave a comment, send greeting and send a friend request. Members and admin will receive a "No subject" email and "this message has no content"   if someone Join the site whatever the reason of the emails Admin will also receive   a "no Subject" the message has no content email.. Instead of telling you about that new user email, Id number and so on.

Most probably you have some email templates missing.

Try to check some known email templates, which you are getting empty, like greeting in admin panel > settings > email templates

Also you can compare it with demo.boonex.com website.