SMS-email addressing for US carriers

Betty at Mail Order asked how she can email a text message.  It’s pretty easy, IT has been doing it for a while, and most carriers provide the service – you just need to know the address conventions.  We have a biz contract with Verizon, and a couple dozen AT&T users, so I knew those two, but Betty needed to text peeps on other networks.  I came across this list and it has been most helpful.  Every major carrier (and some I’ve never heard of) are listed, but here are the ones I was after:

AT&T: #@txt.att.net
Verizon Wireless: #@vtext.com
Nextel: #@messaging.nextel.com
Sprint: #@messaging.sprintpcs.com
T-Mobile USA: #@tmomail.net

EDIT:  Use 10-digit phone number.  The list above specifies it only for some carriers, but all accept 10-digit numbers when SMS-emailing; seems like best practice, IMO.