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If you want to disable IPv6 in linux, You just follow below step.
# vi /etc/sysctl.conf
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# vi /etc/postfix/main.cf
inet_protocols = ipv4
#sudo sysctl -p /etc/sysctl.conf
#postfix reload
When you see this message “postfix/pickup[xxxxx]: fatal: parameter inet_interfaces: no local interface found for ::1”
vi /etc/hosts then remove to “::1″ Line and restart postifx
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