Sending SMS through email is very easy. The key is knowing the correct email format to use. Using this information you can send text messages to the major mobile providers.
Sending text messages through email is free for the sender. The receiver will pay his or her normal messaging charge. Often I use these email to SMS techniques to send alerts from my servers to my mobile devices if something goes wrong.
I try to double check and update these frequently. Several mobile providers have recently combined. Nextel is now part of Sprint, and Cingular has been purchased by AT&T. As the services fold into one another, the email addresses will eventually combine.
Here are the email addresses for the 6 most popular cellular phone carriers:
Virgin Mobile: email@example.com
where phonenumber = your 10 digit phone number
SMS through email for US Cellular, SunCom, Powertel, AT&T, Metro PCS and Alltel are available here.
These email addresses will work from any typical email client. Subject lines are often truncated or completely ignored. Remember that true SMS messages will be limited to 160 characters.
As updates and questions have occurred over the year, people have discussed issues in the comments below.