Any ideas why I got this error? It showed up today in the morning for all the emailboxes I have on the server, different domains. I already restarted the server and everything is back to normal, but I would like to understand why it happen so I can prevent maybe? DFDE944265C: to=<user email box>, relay=dovecot, delay=2360, delays=2360/0.02/0/0.08, dsn=4.3.0, status=deferred (temporary failure. Command output: lda: Error: user <user email box>: Error reading configuration: Invalid settings: postmaster_address setting not given lda: Fatal: Internal error occurred. Refer to server log for more information. ) Thank you, Igor