Maybe I'm the only one who doesn't like receiving PM notifications via email. I have this option set to "Never" I prefer to see it pops up on the top bar everytime I log in instead.
There are times that I will have message but I will not notice it when I visit the forum. I went to 'Personal Message Options' an check Show a popup when you receive new messages. So anytime I was sent a message, it will automatically fill my screen in a way I can click on a button to check the message or a button to decline it. It is really helpful.