I just noticed that I haven't been receiving any tag subscription/filter email — since September 4, 2018!
I've checked my tag subscriptions and they each say:
Subscribe to receive emails of new questions in this filter. You can receive emails every 15 minutes, every 3 hours, or daily.
Emailing every day to
My one filter subscription says the above plus "Confirmation email sent. Please confirm your subscription.", but asking it to resend does not generate any email. (I don't know if that filter ever worked.)
- I've checked my spam and mail filters — nothing there of note.
- I am receiving newsletters and inbox notifications successfully.
- I've seen previous mentions of the subscription system being broken but not more recently than July 2018.
Update: I still have not received any tag subscription email, despite the April 11 fix. I received a subscription confirmation email after requesting one, but no actual subscriptions.