Send Text msg to e-mail address on Nokia Lumia 520

I just switched my service to AT&T, in part because they told me, twice, that I could send a text msg directly to an e-mail address without using an e-mail service on the phone. Now I have a Lumia 520 in hand and I cannot get it to work.

Can anyone tell me how to use the text feature to send a msg directly to an e-mail address?

Many thanks

via Forums de téléphone cellulaire (en français) http://cellphoneforums.net/fr/nokia-lumia/t365116-send-text-msg-to-e-mail-address-on-nokia-lumia-520.html