My server was running fine. suddenly the mail server stop working, no configuration was changed. User cannot receive any email. not even the bounce email. I have tried to install postfix again, but no luck. Jul 11 18:46:44 mail postfix/local[3851]: 5941695F056: to=<[email protected]>, orig_to=<[email protected]>, relay=local, delay=7.2, delays=7.2/ 0/0/0, dsn=5.1.1, status=bounced (unknown user: "ehite")