You might see the error:
postfix/master[5309]: fatal: 0.0.0.0:smtps: Servname not supported for ai_socktype
On a OpenSuSE server when you enable smtps in postfix master.cf file. The reason for the error is that the definition of the smtps port in /etc/services is missing.
Solution
Edit the /etc/services file
vi /etc/services
and add the following lines:
smtps 465/tcp # Secure SMTP
smtps 465/udp # Secure SMTP
Then restart postfix
/etc/init.d/postfix restart
