something is definitely broken - I'm looking into it. There was a major update to the exim mail server (which initially accepts mail for the server) recently and I had to re-implement it a little. That worked fine.
I continued to work on the config to attempt to resolve the complaints I was getting about the server rejecting some senders with misconfigured DNS, and likely I messed it up last night (and went to bed) - this morning (US time) the server was basically rejecting everything on a temporary basis.
I just rolled back to a previous config, and things appear to be working, but of course all that temporarily rejected mail is coming in, so it's going to need a few hours to catch back up. Expect to see delayed messages coming through.
I think at least for the near term, people who are worried about receiving mail from misconfigured servers are going to have to do something else
edit: on further investigation, it looks like that major update deprecated the approach that I was trying to use to whitelist some broken servers - perhaps that explains it.
editedit: unlike many free services "you" are not the product - but sometimes your patience is the product (or at least it's the price). I appreciate it.