To disable the messsage, go to /etc/postfix/main.cf and change from:
inet_protocols = all
to:
inet_protocols = ipv4
send-mail: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol
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To disable the messsage, go to /etc/postfix/main.cf and change from:
inet_protocols = all
to:
inet_protocols = ipv4