My account randomly decided it should no longer receive IM's to e-mail today. Haven't touched that page in years. Might want to check all yours too just incase.
When they were adjusting the max number of offlines for premium users a while back they turned it off for all rpimium users 'by accident', they may have pulled that trick again.
You probably have them going straight to junk, Del! "Whats this SL nonsense, to the trash with it. Seraphim in the message? Pssh, junk mail, obviously. What is that anyway, some kind of angel?"