- Edited
Probably no consolation, but we are having exactly (to a tee) the same problem with the same set up. Started happening whilst using 1.10 a couple of months back. Upgraded to 1.14.2 to see if it helped, but no luck
Edit: Just to add: We set Debug level and generated a couple of tickets. No entries of any type in the log as a result of this. Looks as though the mail function is just not firing.