How to force Force postfix to use only IPv4 protocol?

Here are the steps to Force postfix to use only IPv4 protocol - 

1. Open postfix configuration file. (
# vi /etc/postfix/

2. Change inet_protocols value from inet_protocols = all to inet_protocols = ipv4

3. Now, restart postfix service by using below command.
#service postfix restart

Now, postfix will use only IPv4 protocol.
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