Well, for one your spelling David's last name wrong. It's Boreanaz. So fix that & email again. And as far as I know Emily doesn't do Studio Fan Mail. So that's why that email isn't going through.

Do you realize though, that you won't be getting authentic autographs when you get one through Studio Fan Mail? They are all preprints.

I had seen some feedback that mentioned autograph success using an email address for Emily Deschanel and David Boreanaz. the email addresses were:
emilydeschanel@studiofanmail.com
and
davidboreanaz@studiofanmail.com
I tried emailing both addresses requesting an autograph, both emails came back undeliverable. i tried with two different email service providers just in case it was a problem with my account, but both times the emails didn't got through. I am thinking that these email accounts have been canceled. So for future reference: don't try it.