The following easy to follow guides provide step-by-step instructions on how to setup and troubleshoot your email program with personalised screenshots providing visual examples.
 

 Live Mail 2011
New setup  Troubleshoot
 

Outlook 2010
New setup  Troubleshoot


Mozilla Thunderbird 3
 New setup  Troubleshoot

 
Outlook 2007
 New setup  Troubleshoot
 

Outlook 2002/2003
 New setup  Troubleshoot
 

Outlook 2000
New setup  Troubleshoot
 

Outlook Express
 New setup  Troubleshoot
 

Mozilla Thunderbird
 New setup  Troubleshoot

If you however experience email problems after doing the above settings then keep in mind to double check your internet activity i.e. can you browse web sites etc. seeing that emails is a secondary function of the internet and by default requires a working and reliable internet connection.
 
If you only experience email send problems then you can change your outgoing server setting to be the same as your incoming server but turn authentication on. If this still doesn't solve the problem and you're accessing the internet via another ISP than Salestronics such as Vodacom 3G etc. then you might have to make use of their outgoing email server settings.