CentOS 7.x Resolving postfix not starting due to permission error

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If postfix is not running and starting it is also failing as below: 

[root@mail ~]# su - zimbra
Last login: Wed Mar  6 09:30:35 IST 2019
[zimbra@mail ~]$ zmcontrol status
Host mail.gbb.co.in
    amavis                  Running
    antispam                Running
    antivirus               Running
    ldap                    Running
    logger                  Running
    mailbox                 Running
    memcached               Running
    mta                     Stopped
        postfix is not running
    opendkim                Running
    proxy                   Running
    service webapp          Running
    snmp                    Running
    spell                   Running
    stats                   Running
    zimbra webapp           Running
    zimbraAdmin webapp      Running
    zimlet webapp           Running
    zmconfigd               Running
[zimbra@mail ~]$ zmcontrol restart
Host mail.gbb.co.in
    Stopping zmconfigd...Done.
    Stopping zimlet webapp...Done.
    Stopping zimbraAdmin webapp...Done.
    Stopping zimbra webapp...Done.
    Stopping service webapp...Done.
    Stopping stats...Done.
    Stopping mta...Done.
    Stopping spell...Done.
    Stopping snmp...Done.
    Stopping cbpolicyd...Done.
    Stopping archiving...Done.
    Stopping opendkim...Done.
    Stopping amavis...Done.
    Stopping antivirus...Done.
    Stopping antispam...Done.
    Stopping proxy...Done.
    Stopping memcached...Done.
    Stopping mailbox...Done.
    Stopping logger...Done.
    Stopping dnscache...Done.
    Stopping ldap...Done.
Host mail.gbb.co.in
    Starting ldap...Done.
    Starting zmconfigd...Done.
    Starting logger...Done.
    Starting mailbox...Done.
    Starting memcached...Done.
    Starting proxy...Done.
    Starting amavis...Done.
    Starting antispam...Done.
    Starting antivirus...Done.
    Starting opendkim...Done.
    Starting snmp...Done.
    Starting spell...Done.
    Starting mta...Failed.
Starting saslauthd...done.
postsuper: fatal: scan_dir_push: open directory defer: Permission denied
postfix failed to start


    Starting stats...Done.
    Starting service webapp...Done.
    Starting zimbra webapp...Done.
    Starting zimbraAdmin webapp...Done.
    Starting zimlet webapp...Done.
[zimbra@mail ~]$

Then disabling SELinux might solve the problem.

Refer:


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