Postfix bounce mail on delivery failure

Question

linux

Good evening, tell me how to set up postfix so that if the delivery of the letter fails, the letter with an error gets back to the sender user in the mailbox?

Answer 1

This is what happens by default. show your postfix config and postconf -n|grep bounce

Answer 2

250 2.0.0 from MTA([127.0.0.1]:10025): 250 2.0.0 Ok: queued as A5E473628A1
The letter was successfully accepted by gmail.com