Guide in 
Caddy v2 (community supported) - mailcow: dockerized documentation is not in line with docs.mailcow.email
DNS setup - mailcow: dockerized documentation docs.mailcow.email
It will work if your MAILCOW_HOSTNAME is example.org but not if your MAILCOW_HOSTNAME is as in DNS setup doc mail.example.org
in that case the Caddyfile section below shall be corrected from
MAILCOW_HOSTNAME autodiscover.MAILCOW_HOSTNAME autoconfig.MAILCOW_HOSTNAME {
.....
}to:
MAILCOW_HOSTNAME autodiscover.example.org autoconfig.example.org {
.....
}otherwise Active sync fill not work
