I recently upgraded my site to 3.7 which included a php 7.0 to 7.2 upgrade. All seems fine but I have a strange issue happening and not sure where to look for logs to find the issue.
I have a class with over 200 students in it. The forum, all of a sudden, since the upgrade, is not sending mail notifications to every student. I have mail set up through gmail. I have checked the gmail logs and the people missing notifications are simply not there. Most of them do get sent, just not all - just found the number 109 of 225 get sent...
I did find that the session limit was set to 20 so I raised that to 200 to match my other moodle site which is happily sending over 800 emails through the general news forum. No change.
Seeing as I am using smtp through Google, I can't see that the php upgrade could have affected that - or could it? Is there anywhere I would find logs for that - (running Debian Jesse)?
Is there something that might have changed in Moodle to cap emails sent?
Does anyone have any idea of where I should start?