Gmail is a great email program that allows you to receive email from all your email addresses. All in one account. Nice and tidy. You may also send emails using any of the email addresses you own. These email addresses are known as 'aliases'. To set up email aliases, you need to complete a few simple steps ...

1) login to gmail

http://gmail.com

2) go to settings > accounts

3) click on the link "Add another email address you own" 

fill in the info and check the box "Reply from the same address the message was sent to"

4) click 'verify'

You will receive a verification email in your inbox. you will need to open it and click on the link.

You can go back to the settings > accounts page and set this new email address as your default email if you would like.