Stopped receiving mails


I stopped getting emails about 24 hours ago, and upon logging in to the site, got the message appended below.

I don’t know how to retrigger emails, the message isn’t really clear on that point. I turned email mode off and then on again, but that didn’t do anything, it appears.
(I have been receiving emails from other sources, so i can’t guess what trouble the discourse server (?) has been having, either)

Could a kind admin have look and reset me?