Install SSL in zimbra
Answers
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https://computingforgeeks.com/secure-zimbra-mail-server-with-letsencrypt-ssl-certificate/
If following error occurs, install certbot with snapd
sudo certbot certonly --standalone -d mail.domain.com --preferred-chain "ISRG Root X1" --force-renewal --preferred-challenges http --agree-tos -n -m certmail@domain.com --keep-until-expiring usage: certbot [SUBCOMMAND] [options] [-d DOMAIN] [-d DOMAIN] ... Certbot can obtain and install HTTPS/TLS/SSL certificates. By default, it will attempt to use a webserver both for obtaining and installing the certificate. certbot: error: unrecognized arguments: --preferred-chain ISRG Root X1
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