Can I change my 'From' email address?

Hello all,

I am hoping to change my 'From' email address in Mail.app in Lion. I have my own SMTP credentails to use my own domain email address in gmail. I would love to use this same 'from' address in Mail.app, but I cannot work out how this works. Is this possible? I want to stop having my Gmail address being shown when I use Mail.app.

Ideally, this would also work in the Mail app in iOS. 🙂

I know that I cannot use my own domain email in iCloud, so for now I must continue to use Gmail.

I would love to hear the experiences of powerusers in Mail.app on Lion.

Best,

Nicholas