Got "warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol" from the /var/log/maillog

Solution Unverified - Updated -

Issue

  • Why there are logs as follows in the /var/log/maillog?
postfix/sendmail[3993]: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol
postfix/sendmail[3993]: warning: inet_protocols: configuring for IPv4 support only

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • postfix

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