Extract from their T & C's regarding business package.
12.4 Unless you subscribe to a business package and you are permitted in terms of such business package, you may not resell the ADSL Services, receive any charge or benefit for the use of the ADSL Services or provide Internet access or any other feature of the ADSL Services to any third party or in any other way exploit the ADSL Service for any commercial purposes. The ADSL Service is intended for periodic, active use of the internet. You may not run a server in connection with the ADSL Services. You may not provide network services to others via the ADSL Services. In addition, you are prohibited from running servers for, including without limitation, mail, http, ftp, irc and multi-user interactive forums. You may not share your ADSL Services.
How the hell can a business not host a mail server?
12.4 Unless you subscribe to a business package and you are permitted in terms of such business package, you may not resell the ADSL Services, receive any charge or benefit for the use of the ADSL Services or provide Internet access or any other feature of the ADSL Services to any third party or in any other way exploit the ADSL Service for any commercial purposes. The ADSL Service is intended for periodic, active use of the internet. You may not run a server in connection with the ADSL Services. You may not provide network services to others via the ADSL Services. In addition, you are prohibited from running servers for, including without limitation, mail, http, ftp, irc and multi-user interactive forums. You may not share your ADSL Services.
How the hell can a business not host a mail server?