Send an email with SMTP

Question

I'm making an email spoofer. I am currently using the gmail smtp server with my credentials, but it sends from my gmail email. How can I make it so that it sends from the email the user inputted in the form? Or if anyone knows any tutorials that would be great as well.

I tried to post my source code but it's all on the same line, etc. Hard to read. Download my Form1.cs source here: (.txt file) http://www.mediafire.com/file/88hamalqmeq592o/Form1.txt