- Plesk Onyx 17.5 for Linux
Webmail of a domain with dedicated IP has another default server IP on Plesk 12.5. After upgrade to Onyx 17.5 webmail configs in webserver were built with dedicated IP of a domain.
Currently, root cause is unknown.
1. Go to Subscriptions > example.com > DNS Settings .
2. Change DNS of webmail.example.com to the domain's IP address.