AT&T: number@txt.att.net
T-Mobile: number@tmomail.net
Verizon: number@vtext.com
Sprint: number@messaging.sprintpcs.com or number@pm.sprint.com
Virgin Mobile: number@vmobl.com
Tracfone: number@mmst5.tracfone.com
Metro PCS: number@mymetropcs.com
Boost Mobile: number@myboostmobile.com
Cricket: number@sms.mycricket.com
Nextel: number@messaging.nextel.com
Alltel: number@message.alltel.com
Ptel: number@ptel.com
Suncom: number@tms.suncom.com
Qwest: number@qwestmp.com
U.S. Cellular: number@email.uscc.net

http://20somethingfinance.com/how-to-send-text-messages-sms-via-email-for-free/ Retrieved 26 June 2014

Official Carrier documentation

AT&T – http://www.att.com/esupport/article.jsp?sid=KB63037&cv=820#fbid=JpXkLYThLTs

Verizon – http://www.verizonwireless.com/news/article/2013/06/computer-to-phone-text-messaging.html

Other resources

http://www.ukrainecalling.com/email-to-text.aspx

http://www.emailtextmessages.com/ (last updated November 15, 2007)

http://newtech.about.com/od/mobile/a/Sms-Gateway-From-Email-To-Sms-Text-Message.htm (last updated unknown)