warning: connect to Milter service inet:127.0.0.1:12768: Connection refused

[KamalG]

Aug 22 19:53:30 server postfix/smtpd[30617]: disconnect from localhost[127.0.0.1]
Aug 22 19:53:37 server courier-authdaemon: modules="authpsa ", daemons=5
Aug 22 19:53:37 server courier-authdaemon: Installing libauthpsa
Aug 22 19:53:37 server courier-authdaemon: Installation complete: authpsa
Aug 22 19:53:37 server postfix/smtpd[30617]: connect from localhost[127.0.0.1]
Aug 22 19:53:37 server postfix/smtpd[30617]: warning: connect to Milter service inet:127.0.0.1:12768: Connection refused
Aug 22 19:53:37 server postfix/smtpd[30617]: NOQUEUE: milter-reject: CONNECT from localhost[127.0.0.1]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
Aug 22 19:53:37 server postfix/smtpd[30617]: disconnect from localhost[127.0.0.1]
Aug 22 19:53:47 server postfix/smtpd[30617]: connect from localhost[127.0.0.1]
Aug 22 19:53:47 server postfix/smtpd[30617]: disconnect from localhost[127.0.0.1]

I am fed up with frequent problems in my email

postfix check
postfix/postfix-script: warning: not set-gid or not owner+group+world executable: /usr/sbin/postdrop

Shutting down postfix:                                     [  OK  ]
Starting postfix:                                          [  OK  ]
[root@server logs]# tail -f /var/log/maillog
Aug 22 19:53:37 server postfix/smtpd[30617]: NOQUEUE: milter-reject: CONNECT from localhost[127.0.0.1]: 451 4.7.1 Service unavailable - try again later; proto=SMTP
Aug 22 19:53:37 server postfix/smtpd[30617]: disconnect from localhost[127.0.0.1]
Aug 22 19:53:47 server postfix/smtpd[30617]: connect from localhost[127.0.0.1]
Aug 22 19:53:47 server postfix/smtpd[30617]: disconnect from localhost[127.0.0.1]
Aug 22 19:58:07 server postfix/postfix-script[1100]: warning: not set-gid or not owner+group+world executable: /usr/sbin/postdrop
Aug 22 19:59:20 server postfix/postfix-script[1136]: stopping the Postfix mail system
Aug 22 19:59:20 server postfix/master[28560]: terminating on signal 15
Aug 22 19:59:20 server postfix/postfix-script[1205]: warning: not set-gid or not owner+group+world executable: /usr/sbin/postdrop
Aug 22 19:59:20 server postfix/postfix-script[1211]: starting the Postfix mail system
Aug 22 19:59:20 server postfix/master[1212]: daemon started -- version 2.8.17, configuration /etc/postfix

I haven't touched any configuration files, this was after a fresh snapshot restore.

Please help me how to fix this

 

[IgorG]

What is exact values for lines

smtpd_milters
non_smtpd_milters

in /etc/postfix/main.cf file?
Try to comment them and check what goes on.