I don't seem to be getting email notifications about my own caches anymore, and the watch notifications seems suspiciously bad as well.
I've tested posting a note on one of my own caches, which usually promptly delivers a mail to my inbox, but nothing. A friend tried on his cache as well without success. And it seems like mails triggered found logs from PM notifications aren't sent out either (friend has a bunch of those).
Neither of us have changed any settings, I use GMail and he runs his own mail server, so it's completely separate mail recipient services as well.