I am 'nagiosadmin' and I have a contact 'philnewlon'. I have notifications turned off to user 'nagiosadmin' so that I don't get confused as to whether a message has been sent to the user nagiosadmin or the contact philnewlon. Contact philnewlon is in the contact group 'dmb group'.>> Can you post the email notification messages for the XI users 'nagiosadmin' and another user in the DMB Group? These messages are customized per-user, so you can access them from Configure->My Account Settings->Notification Messages.
I read that doc - there is no 'user <-> contact' correlation in this case.>> Your host and service notification period for each XI users needs to be <username>_notification_times in order to work correctly.
They are around the same time. To eliminate the possibility that there is an email backup as you suggest, I have been using tcpdump watching port 25 so I know exactly when/if a message is spewed out.>> Do the timestamps on the contradicting emails appear to be around the same time, or could there be some issue with the email server getting backed up?
I think I have figured out why all messages quit flowing at all for a while - I tried to use the xi_host|service_notification_handler instead of notify_host|service_by_email without a user/contact relationship.