When you connect to your workplace's VPN, you may not notice that you are using your workplace's servers to serve up webpages. This might be undesirable since the workplace can log all the places you've been. It also might be very slow to load pages because you are using your workplace server to send pages to you.
Here is the fix.
Open your VPN Connection
Click on the Networking Tab
Here is the fix.
Open your VPN Connection
Click on the Networking Tab
Click on TCP/IP
Click on Advanced
Uncheck Use Default Gateway on Remote Network.
by: piji on 2010-10-14 at 23:40:10ID: 20518
The reason for that was the ISP of client was different from the server and obviously their mail server was different as well.
If you don't uncheck "Use default gateway on remote network", then client gateway will be the server ISP instead of his own. Thus, the client computer trying to send something through different mail server.