These are the steps to Force postfix to use only IPv4
1. Edit the main postfix configuration file (main.cf)
1. Edit the main postfix configuration file (main.cf)
# vi /etc/postfix/main.cf
2. Change inet_protocols setting from inet_protocols = all to inet_protocols = ipv4
3. Restart the postfix service by using the following command.
#service postfix restart
Postfix is now configured to use IPv4 only.
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