[Antivirus]

Originally Posted by hugh_

The title and notification show one sender and the PM itself another.

I don't quite understand what you mean. Are you saying that when you open the PM, the sender is different then what shows in the popup "you have received a new private message from {1}" phrase?

Originally Posted by hugh_

Regardless would it be possible to include some kind of logic to check what the user's settings are and not make any changes (or send notifications) if they've already been processed in order to avoid accidental spamming?

If the user has already been processed, then the change in settings would prevent any further emails going out to them, unless you're sending emails with "include users who have not chosen to receive emails from admins" checkbox. You can't send to those members otherwise you defeat the entire purpose of this modification.