You can purchase the Unlimited Email service when registering or renewing the domain, or at any time from the Additional Service area of the website The cost for this service is 12,91 Euro a year + VAT.
Once the service has been activated you can create  an unlimited number of email accounts from the Mail Admin Control Panel.

The service can also be ordered during the subscription period: in this case, the expiry date will be the same as that of the domain to which the service is associated.
If the domain has been registered or renewed for a period longer than one year, the unlimited emails must also be ordered for the same period.