Not able to use SMTPS port for Zimbra 8
I have installed zimbra 8 server in centos 6.4 and that is working fine with pop3 and imap and smtp ports. But i want to use secure ports. Secure ports for pop3 and imap are fine. But i am unable to use smtps port 465.
# netstat -an | grep :25
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
# netstat -an | grep :465
tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN
I have tried the following steps.
added the following lines in /opt/zimbra/postfix/conf/master.cf
smtps inet n - n - - smtpd
-o smtpd_tls_wrappermode=yes -o smtpd_sasl_auth_enable=yes
After reloading the service the master.cf file is revert back to default. My modifications are not there.
Is there any way to use secure SMTP port 465?
Please help me to clear this. I appreciate your understanding and thank you in advance.