No filtering involved in my situation. Either the emails aren't being sent to me or there's a communication problem between the Flyertalk email server and my MX. Multiple people had the problem start at the same time so it seems there is something systemic and not unique to my situation.

I am motivated to help solve this, so let me know what I can do to help troubleshoot. One thing to start with might be for someone to send me a PM to see if I get email notification of that.

I didn't realize I could send PMs to myself. I just did, and received the email notification. So either the problem is fixed (we won't know until tomorrow morning) or it affects the subscription emails but not other emails comms.