Postfix disable IPv6

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To disable IPv6 on the postfix mail server, edit

vi /etc/postfix/main.cf

Find

inet_protocols = all

Replace with

inet_protocols = ipv4

Restart postfix

systemctl restart postfix

Method 2

postconf -e inet_protocols=ipv4
systemctl restart postfix

To see the current configuration, run

[root@server ~]# postconf inet_protocols
inet_protocols = ipv4
[root@server ~]#

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