You can use the Dedicated Servers for Websites, Databases, Custom Applications, Ecommerce, DNS, File Storage, and Emails. Emails, however, must be restricted to personal, organizational, or professional purposes.
The use of Dedicated Servers to send out mass emails/marketing is NOT allowed and can attract penalties. We equipped our network with anti-spam software that automatically blocks port 25 if it detects spam-sending. The first time unblocking the port is free; the successive unblocking of port 25 costs €5 each time.