cingular users, whats the email extension for cingular phones. to send a txt message to a phone from email etc.

i know verizons is xxxxxxxxxx@vtext.com, but it's my girlfriends birthday and i want her phone to get a text at exactly 6:17 (the time her alarm clocks set to) and she has cingular, can anyone help me out?

:edit:
nevermind i got it