CentOS 7.x configure postfix to use only ipv4

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<yambe:breadcrumb>CentOS_7.x_postfix_configuration|CentOS 7.x postfix configuration</yambe:breadcrumb>

CentOS 7.x configure postfix to use only ipv4

By default based on DNS postfix might resolve IPv6 addresses also. To force postfix to use only IPv4 set 

  inet_protocols = ipv4

and restart postfix

Refer:

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