For example, if you are sending a text message to a Nextel subscriber with the phone number 232-232-2323, you would enter 2322322323@messaging.nextel.com. Enter your subject in the subject line if you want -- it's optional -- and compose your text message in the body of your email.ending a text message via e-mail on a computer requires the cell phone number and the appropriate carriers SMS for text messages.... 1  How to Email Text Messages to Any Phone.