Vodamail Authentication

<p>Why do I have to change my Vodamail outgoing server settings when i switch networks? On the Vodacom network the SMTP server does not require authentication and on other networks do you require authentication. So everytime i switch to Wifi, I have to change the settings or i cant send mail. I have spent hours on the phone with Vodacom support, been to numerous vodashops, and no one so far can help. Are there settings that would work on any network?</p>