Sending E-Mail Problem

I am using following code to send mail. 

 

(1) Its working fine on the server where Internet in connected but gives error on client machine. error is " COULD NOT CONNECT TO THE SERVER smtp.gmail.com".

Client is connected to the server with LAN and it order to use the internet on client machine, I have to give the proxy user-id and password i.e. user-id=user and password=user (proxy settings)

May be because of this? how can I soulve the problem?

 

 

(2) Another problem is that if I am using the code in my personal home computer, where I am using the "Reliance Net Connect" to access the Internet, what is the server IP I have to specify in server.

If I am specifying "localhost" mail placed in Queue folder (C://In ...