Hello,
The e-mail settings that you can edit through Menu->Administrator->Mail server settings is configuration used by system e-mails, like error reporting, new user information, etc.
If you want to send and receive e-mails through EPESI, you need to go to Menu->My Settings->Control Panel and there select E-mail Accounts. After you add your account information, you can access your mails by going to Menu->E-mail.
To have e-mail messages appear under contacts, you can use the Archive feature added to Roundcube Mail Client. Some more information on this topic is available in this post:
viewtopic.php?p=3148#p3148
Kind regards,
Arek