SMS/Email Domains for U.S. Cellular Providers

I often see people asking how to send SMS messages from their website. Well, you can do so through your SMTP server or if you're using some other type of email system, for instance Postfix on Debian, you can use that too.

You send the message/email just like you would any other email, you just have to direct it to the address the service provider has setup to recieve messages.

In most cases this is the cellphones ten digit number @ provider-address dot com.
Below is a list of common U.S. service providers and the domain they have setup to recieve SMS messages via email protocols.

Carrier	Domain Pattern
AirTouch Cellular	10digitphonenumber@airtouchpaging.com
Alltel	10digitphonenumber@alltelmessage.com
Ameritech Cellular	10digitphonenumber@paging.acswireless.com
AT&T Wireless	10digitphonenumber@mobile.att.net
Bell Atlantic	10digitphonenumber@message.bam.com
BellSouth	10digitphonenumber@wireless.bellsouth.com
Cellular One	Not available from carrier
Cingular Wireless	10digitnumber@mobile.mywireless.com
Comcast Cellular	10digitphonenumber@cellularone.tstmsg.com
GTE Wireless	10digitphonenumber@messagealert.com
Nextel	10digitphonenumber@page.nextel.com
Omnipoint	10digitphonenumber@omnipointpcs.com
Pacific/Nevada Bell	1+10digitphonenumber@pacbellpcs.com
PrimeCo	10digitphonenumber@primeco.textmessage.com
Southwestern Bell	10digitphonenumber@email.swbw.com
Sprint	10digitphonenumber@messaging.sprintpcs.com
Suncom	10digitphonenumber@mobile.att.net
TMobile	10digitphonenumber@tmomail.net
Telecorp	10digitphonenumber@mobile.att.net
Tritel	10digitphonenumber@mobile.att.net
Triton PCS	10digitphonenumber@mobile.att.net
U.S. West	10digitphonenumber@uswestdatamail.com
Verizon	10digitphoneumber@msg.myvzw.com
Voicestream	10digitphonenumber@voicestream.net
Boost Mobile	10digitphonenumber@myboostmobile.com

Google is able to look these up just by having the number somehow, I'd really like to know where's they're getting it from.