The feedback is the there was an outage with email in Durban that was resolved withing two hours. If you still have issues with mail please check that you are using automatic DNS settings. If you have manually configured them, then here is the correct settings:
Johannesburg (Pretoria, Bloemfontein, PE, North West, Nelspruit, Polokwane):
Primary: 196.2.97.234
Secondary: 196.46.70.10
Third: 41.208.247.5
Cape Town:
Primary: 196.46.70.10/11
Secondary: 196.2.97.234
Third: 41.208.247.5
Durban (and Pietermaritzburg):
Primary: 41.208.247.5
Secondary: 196.46.70.10
Third: 196.2.97.234