Question Webmail without mail services

[Reboot]

Is it possible to use Roundcube webmail from Plesk itself without mailservices?

When I manually go to to admin/webmail, I get the list of webmails with a red warning sign. Upon mouseover it states: "webmail not available".

Is there any way to trick or force Plesk to enable it? Chaning Roundcube to use other mail servers isn't that hard as well...

 

[IgorG]

What do you mean "without mailservices"?
SMTP server can be defined only as Postfix, Qmail or MSMTP (relay only) but not None.
IMAP server can be only Courier IMAP or Dovecot but not None.
How you imagine Plesk "without mailservices"?