Here is a list of the majority of SA ISP providers and their respective SMTP mail server addresses.

Internet Service Provider	SMTP Server Settings
@lantic	smtp.lantic.net
Cell C	mail.cmobile.co.za
Global	smtp.global.co.za
Iafrica	smtp.uunet.co.za smtp.iafrica.com
iBurst	smtp.wbs.co.za smtp.iburst.co.za
Internet Solutions	smtp.isdsl.net (ADSL) smtp.dial-up.net (56k dial up on IS)
MWEB	smtp.mweb.net (ADSL) smtp.mweb.co.za (56k dial-up)
MTN	smtp.mtn.co.za
Neotel	smtp.neomail.co.za
Netactive	smtp.netactive.co.za
SAIX (Telkom)	smtp.saix.net
Sentech	smtp.sentech.co.za
Telkom	smtp.saix.net (ADSL) smtp.telkomsa.co.za (56k dial up) smtp.telkomsa.net
Tiscali	smtp.tiscali.co.za
Vodacom	smtp.vodacom.co.za
Web Africa	smpt.wa.co.za