Step 1:

The information which is necessary in order to set up the email account in your local software (Outlook, Thunderbird etc.) can be found directly inside your KAS (gestione tecnica) panel:

Email account
Username/Account name
Password
Incoming and outgoing email server

Once inside the KAS (gestione tecnica) panel, click the menu item Email -> Email Account and the Edit icon right next to the respective email account.