I added a new recipient to an alert notification today, with a different domain than we normally use. I started getting SMTP 550 “Unable to relay” errors in the console. The problem is that there were 2 recipients set up for this notification and the above error stopped the notification system from sending it to either.
I do realize the underlying error is a mail server issue and I’ve worked around it by using a different mail server.
This is on Ignition 7.5.4.