First, please accept my apologies for responding to this after so many months. Some how i missed Tim's response, and today while searching for a solution once again in the Internet, i came across my own question and Tim's response..

Yes, the from field that i get in my email is not the one entered in the form. It is the email address of my organization's email account that is used to send all the emails.. e.g.: support@xyz.com... My emails are hosted on google apps, and my linux machine is running exim which is configured as a smart host that uses google apps email account to send the email messages..

That makes me think that perhaps google apps does not allow the from hearder to be changed... So when my drupal server with exim connects to gmail and uses a gmail account to send the message, even though drupal changed the from header to the email address in the contact form, gmail automatically replaces it with the gmail address for the gmail account that was authenticated and is being used to send the email message..

Some one may ask why do i want to use gmail and not directly ask exim smtp to connect to the other smtps. Well, the global IP address that i have that smtp server will be using to send email is a home dsl ip, and major smtp servers like hotmail etc do not accept email for the range of IP that are for home etc.. Hence, i was forced to proxy through gmail smtp, but then now gmail does not allow me to change the from header.. Any solutions..

Many Thanks..

-Nabil.