Solution is straightforward:

  2. open /etc/postfix/main.cf
  3. comment out inet_interfaces: all
  4. add inet_protocol: ipv4

 

[root@test logs]# vim /usr/sbin/postconf

[root@test logs]# vim /etc/postfix/main.cf

[root@test logs]# systemctl status postfix.service

● postfix.service - Postfix Mail Transport Agent

Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)

Active: failed (Result: exit-code) since Wed 2018-08-22 20:00:52 CST; 3min 1s ago

Aug 22 20:00:50 test systemd[1]: Starting Postfix Mail Transport Agent...

Aug 22 20:00:50 test aliasesdb[5051]: /usr/sbin/postconf: fatal: parameter inet_interfaces: no local interface found for ::1

Aug 22 20:00:51 test aliasesdb[5051]: newaliases: fatal: parameter inet_interfaces: no local interface found for ::1

Aug 22 20:00:51 test postfix/sendmail[5054]: fatal: parameter inet_interfaces: no local interface found for ::1

Aug 22 20:00:51 test postfix[5059]: fatal: parameter inet_interfaces: no local interface found for ::1

Aug 22 20:00:52 test systemd[1]: postfix.service: control process exited, code=exited status=1

Aug 22 20:00:52 test systemd[1]: Failed to start Postfix Mail Transport Agent.

Aug 22 20:00:52 test systemd[1]: Unit postfix.service entered failed state.

Aug 22 20:00:52 test systemd[1]: postfix.service failed.

[root@test logs]# systemctl stop postfix

[root@test logs]# systemctl start postfix

[root@test logs]# systemctl status postfix.service

● postfix.service - Postfix Mail Transport Agent

Loaded: loaded (/usr/lib/systemd/system/postfix.service; enabled; vendor preset: disabled)

Active: active (running) since Wed 2018-08-22 20:04:09 CST; 5s ago

Process: 5496 ExecStart=/usr/sbin/postfix start (code=exited, status=0/SUCCESS)

Process: 5493 ExecStartPre=/usr/libexec/postfix/chroot-update (code=exited, status=0/SUCCESS)

Process: 5486 ExecStartPre=/usr/libexec/postfix/aliasesdb (code=exited, status=0/SUCCESS)

Main PID: 5569 (master)

CGroup: /system.slice/postfix.service

├─5569 /usr/libexec/postfix/master -w

├─5570 pickup -l -t unix -u

└─5571 qmgr -l -t unix -u

Aug 22 20:04:08 test systemd[1]: Starting Postfix Mail Transport Agent...

Aug 22 20:04:09 test postfix/postfix-script[5567]: starting the Postfix mail system

Aug 22 20:04:09 test postfix/master[5569]: daemon started -- version 2.10.1, configuration /etc/postfix

Aug 22 20:04:09 test systemd[1]: Started Postfix Mail Transport Agent.

[root@test logs]#