That is not my question.I want to know how the customer can access webmail directly without having to access cyberpanel.
For example webmail.domain.com instead of mypanel.myhosting.com:8090/rainloop/index.php
You can always set up your own drop-in, standalone installation of Rainloop and direct your customers to that website. Then and there, your customers could even use the password changing plugin that I created not too long ago!