Thanks! Interesting. It’s a little messy - two different accounts and one of them working OK, may have to delete one of the accounts in order to look at the other. But what I see in there, it goes through the folder getting flags and status 500 messages at a time. There are close to 8,000, so it’s a good idea to break it down - but then it apparently decides 8,000 messages isn’t so much after all, because it issues a big “UID FETCH” command that I only get to see 2048 bytes of, so I don’t know what it’s asking for, but … I guess it doesn’t get it, because that’s the last I hear, no A0000020 OK response.
I’m guessing, “Mail” isn’t for big folders.