Hi is there any good reason why this is rejected with 450 instead 5xx to tell the sending server "do not try again with your config"?
Nov 16 03:53:37 mail postfix/smtpd[15778]: NOQUEUE: reject: RCPT from unknown[193.83.162.5]: 450 4.7.1 Client host rejected: cannot find your reverse hostname, [193.83.162.5]
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