Host or domain name not found. Name service error for name=example.com
If you are getting the error above, your e-mail service is most likely trying to send via IPv6.
Follow the steps below to resolve the error.
nano /etc/postfix/main.cf
inet_protocols = all > inet_protocols = ipv4
If you edit it as above and restart the service with the command below, the problem will be solved.
systemctl restart postfix
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