Depending on which type of internet you are using, you may need to use one of the following Outgoing Servers in order to send messages successfully.
If using Telkom ADSL, outgoing server is smtp.dsl.telkomsa.net
If using Telkom Analogue Dial Up, use smtp.saix.net or smtp.dsl.telkomsa.net
If using Mweb, outgoing server is smtp.mweb.co.za or smtp.mweb.net
If using Vodacom 3G, outgoing server is smtp.vodacom.co.za
If using MTN 3G, the outgoing server is mail.mtn.co.za
If using Cell C the outgoing server is mail.cmobile.co.za
If using Iburst, outgoing server is smtp.iburst.co.za
If using I.S. the outgoing server is smtp.isdsl.net
If using goggaconnect outgoing server is smtp.vodacom.co.za
If using Neotel, outgoing server is smtp.neomail.co.za
For ABSA, outgoing server is smtp.absamail.co.za or mail.absa.co.za
@lantic (ADSL,Dialup, ISDN) : smtp.lantic.net
NetActive (ADSL,Dialup, ISDN) : smtp.netactive.co.za
