Separate email server from web server

[T.C.]

Hello,
I'm thinking about the opportunity to move all the email accounts currently on "server A" on a different server "server B".
"server B" is a server with imap and smtp services and without webmail client, while "server A" is a web server with email services disabled.
What I wanna do basically is to make migration transaprent to my customers, so I'd like to reconfigure roundcube on "server A" to fetch email from "server B".
How can I tell roundcube to fetch email from server B instead of server A?
If I disable email services on server A does the webmail client interface remain available to my customers?

Btw password sync is not a concern.

Thanks

 

[cPanelMichael]

How can I tell roundcube to fetch email from server B instead of server A?

Hello,

The webmail applications included with cPanel assume the email is stored and handled locally. You could install Roundcube on the remote mail server and configure the "webmail" subdomain to point to the Roundcube installation on the remote server.

Thank you.