Notifications Sometimes Not Sent

I have one forum user who from time to time does not get a notification of a new post in some threads. I have checked he is subscribed to that thread and checked the log and seen no notifications sent in the particular instances he quotes. There may be other users who are also not getting some notifications but maybe they have not noticed. I also note that on the most recent example he told me of there were no notification emails in the log sent that day. What should I be checking? Any suggestions are welcome. Thanks Hi Bob, Sorry for the late reply. First thing that comes to mind is to see whether background notifications are enabled. Depending on the number of users, if background notifications are off, the web server may kill the process before all emails have been triggered. Next, I’d recommend checking not only a local email log plugin, but the logs of whatever email service you have configured to use. If a message shows up in the local log, then it left the server. The email service logs will tell you what happened with the message from that point on. Double check your SPF and DKIM records to make sure that messages aren’t getting flagged as spam. Cheers, Vinny