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Hello, my server (been running fine for 4yrs) around 10am this morning started bouncing every email with error '554 5.4.6 < #5.4.6 X-Postfix; mail for mail.mydomain.com loops back to myself>' there was a yum update for 1 thing this morning but it didnt at the time seem mail related. really stuck on this now....
maybe this will help
Oct 10 16:22:14 mail postfix/smtp[2372]: D51E5112E80F: to=wclune-tld@mail.tld.com, orig_to=wclune@tld.com, relay=none, delay=0.02, delays=0.01/0.01/0.01/0, dsn=5.4.6, status=bounced (mail for mail.thespaminator.com loops back to myself)
Don't know you did a reboot and before that all log files safed wich update you could see in some log files maybe.
AL dns tests ok?
If your domain is thespam... then Server Apache/2.4.6 and X-Powered-By PHP/7.3.10 the version should not be open known take care of config for that.
Also you have hostname mx.thespaminator.com and not mail. saying by dns test