How to Send a Text Message From Yahoo Mail

1. Open a browser window and navigate to your Yahoo! Mail account. Log in with your ID and password.
2. Click 'New' and select 'Email Message' from the drop-down menu.
3. Enter the recipient's mobile phone number followed by '@' and the SMS gateway in the 'To' field. The SMS gateway works in the same manner as the domain in an email address. An example email address for a Boost Mobile cell phone customer is 1234567890@myboostmobile.com.
4. Type the text for the message in the body of the email. Messages longer than 160 characters may be received in several messages or truncated.
5. Click 'Send' and your text message will be sent to the recipient's cellphone.