We have set up this demo to have basic email integration enabled.
By sending an email to firstname.lastname@example.org you can open a support ticket. To prevent abuse the Approval system is enabled. Any emails that will open a new ticket we be presented in the "EMails" tab of the support admin section. Here they require the "Approve" button to be used to add them as tickets. Any replies to a ticket notification email will automatically be added when the account is checked.
The email account is checked every 5 minutes so there may be a small delay in your email being added to the emails tab.