Quick question: We're having some reported issues with our email notifications for private messages and I wanted to clarify exactly how they work to help our investigations.

Am I right in thinking that there is not option for a user to turn them off/on as there is with the others?  (I can't find it on the preferences section if there is).

Does it only notify you if you're not logged in at the time that a message is sent?  I suspect our installation is doing this but I wanted to check if that is how it's designed or whether it's our mail server doing something odd.

Thanks