Here is a list of the most common Outgoing servers:.
For Telkom ADSL, outgoing server is smtp.dsl.telkomsa.net or smtp.saix.net
For Telkom Analogue Dial Up, use smtp.saix.net or smtp.dsl.telkomsa.net
For 8TA (Eita), the outgoing server is smtp.saix.net
For MWEB ADSL, outgoing server is smtp.mweb.co.za or smtp.mweb.net
For Vodacom 3G, outgoing server is smtp.vodacom.co.za
For MTN 3G, the outgoing server is mail.mtn.co.za
For Cell C the outgoing server is mail.cmobile.co.za
For Iburst, outgoing server is smtp.iburst.co.za
For I.S. ADSL the outgoing server is smtp.isdsl.net
For I.S. 3G the outgoing server is smtp.isgsm.netor smtp.dial-up.net
For goggaconnect outgoing server is smtp.vodacom.co.za
For Neotel, outgoing server is smtp.neomail.co.za
For ABSA, outgoing server is smtp.absamail.co.za or mail.absa.co.za
For @lantic (ADSL,Dialup, ISDN) : smtp.lantic.net
For NetActive (ADSL,Dialup, ISDN) : smtp.netactive.co.za
For Polka (ADSL,Dialup, ISDN) : smtp.polka.co.za
For Web Africa (ADSL,Dialup, ISDN) : smtp.wa.co.za
For Cybersmart : smtpauth2.cybersmart.co.za or smtp.cybersmart.co.za