How to fix postfix/smtp Network is unreachable error

When trying to send email to a gmail account through postfix you can see an error like this in the postfix logs /var/log/maillog : Solution for IPv4  If you want to use IPv4 instead, then you should edit the Postfix configuration file: And change inet_protocols = all to inet_protocols = ipv4 and restart or reload Postfix: Solution for IPv6 …

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