Standard for automatic mail server responses?

Question

Email

I scrolled through the list of RFCs on this topic, but I just can't figure out the essence. What information about the sent letter can be obtained from the server's automatic response in case of failure to send the letter, and what document determines this?

Answer 1

The answer was found in tools.ietf.org/html/rfc3461 , thanks to Alexey Erokhin :)