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postconf mail_version

http://www.postfix.org/SASL_README.html

docker run --rm -v $(pwd)/letsencrypt:/etc/letsencrypt -ti certbot/certbot certonly --agree-tos --manual --preferred-challenges dns --server https://acme-v02.api.letsencrypt.org/directory --manual-public-ip-logging-ok -d "*.example.com"

• auto renew

  --force-renewal

https://maddy.email/tutorials/setting-up/