[root@rhel7 ~]# systemctl start postfix
Job for postfix.service failed because the control process exited with error code. See "systemctl status postfix.service" and "journalctl -xe" for details.
[root@rhel7 ~]# systemctl status postfix
postfix.service - Postfix Mail Transport Agent
Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Sun 2020-02-23 18:45:54 CST; 7s ago
Process: 36203 ExecStart=/usr/sbin/postfix start (code=exited, status=1/FAILURE)
Process: 36201 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)
Process: 36199 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)
Feb 23 18:45:53 rhel7.6 systemd[1]: Starting Postfix Mail Transport Agent...
Feb 23 18:45:53 rhel7.6 postfix[36203]: warning: valid_hostname: numeric hostname: 6
Feb 23 18:45:53 rhel7.6 postfix[36203]: fatal: file /etc/postfix/main.cf: parameter mydomai...: 6
Feb 23 18:45:54 rhel7.6 systemd[1]: postfix.service: control process exited, code=exited status=1
Feb 23 18:45:54 rhel7.6 systemd[1]: Failed to start Postfix Mail Transport Agent.
Feb 23 18:45:54 rhel7.6 systemd[1]: Unit postfix.service entered failed state.
Feb 23 18:45:54 rhel7.6 systemd[1]: postfix.service failed.
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