Is Sneakemail Dead?

sneakemail.com is sort of a "antispam" service. They don't block spam but they allow creating a number of addresses that can relay replies to a real address, also adding an unique identifier for each address so that if someone did leak the email address it makes possible to recognize them and take appropriate action.

I've been a paying user of their service for years, and it has been literally a godsend for signing to services I didn't trust telling my real email address, I could catch many sites leaking/selling addresses that I promptly blacklisted. Unfortunately it suddenly stopped relaying emails. I can't tell exactly when it stopped working as I didn't use it much in the last months, however I noticed last week with two new addresses I created and wrote them to let them know but got no reply. Note that the service dashboard seems fully working, though, so that one realizes they don't relay emails only when it's too late. Did anyone experience the same problems? Any recommendation for similar services?