Install SSL in zimbra

sachin

Secure Zimbra Server with Let’s Encrypt SSL Certificate

sachin

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

https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-debian-11