Got "IPv6 support is disabled" or "disabling IPv6 name/address support" from the /var/log/maillog

Solution Verified - Updated -

Issue

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

postfix/xxxx[PID]: warning: inet_protocols: disabling IPv6 name/address support: Address family not supported by protocol

Environment

  • Red Hat Enterprise Linux 10
  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • postfix

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