Good afternoon.
The answer to your question was given in the same topic.
You have a problem with the
constantagro@ukr.net mailbox through which you send newsletters.
Fix the integration so that it works correctly, or don't do mailings.
2022-04-24 at 10 am you are doing the newsletter "Christ is Risen!"
It stopped working, because there are 1250 letters in the queue for sending.