Mine
public text v1 · immutableERROR: I could not complete a connection to any of your mailservers!
istud.ru: Timed out [Last data sent: RCPT TO: ]
If this is a timeout problem, note that the DNS report only waits about 40 seconds for responses, so your mail *may* work fine in this case but you will need to use testing tools specifically designed for such situations to be certain.