I have a guide at https://skippy.org.uk/lets-encrypt-postfix-and-dovecot/
however for multiple domains - "./letsencrypt-auto certonly --webroot -w /etc/sentora/panel/ -d njoror.squashedfly.eu -d -d mail.freedompress.org.uk -d mail.squashedfly.eu"
however for multiple domains - "./letsencrypt-auto certonly --webroot -w /etc/sentora/panel/ -d njoror.squashedfly.eu -d -d mail.freedompress.org.uk -d mail.squashedfly.eu"