Well, I was excited about my new newsletter until, four days in, I got the above message. TinyLetter kept asking me incomprehensible questions ("Is there a record available to support that each of these contacts have gone through an opt-in process?” — to which the answer is, Yes, and you have that record, since they’ve signed up through your form) but wouldn’t answer any of mine, and now have fallen silent. So at the moment it looks like the newsletter is dead before it even really gets started. But we’ll see.