I have pings setup as documented https://premium.wpmudev.org/forums/topic/documentation-on-ping#post-122969
When I go directly to the ping url it works. http://mymeetingssite.com/pingnewsubscriber.php albiet with blank information.
I have edited the member level to ping on joining. But I'm not receiving the email.
PS: The message is being sent via pureftp user, if that helps