So you have to log on. Then select Members, then search for your own name, and then click on your name to bring up the summary member/profile info page.
Then, under Modify Profile, select "Personal Message Options".
At: "Notify by email every time you receive a personal message:", select "Never".
Is there no way of getting there via "Profile" from the main menu? If not, may I suggest that capability be added?
Thanks.