My mobile phone (a Treo 700p) uses the same "email address" as my computer. So if I emailed a picture/attachment, it'd work.
But if you are talking about sending an MMS (multimedia SMS text message) as an email, yes, it'd be addressed from something like
yourphonenumber@yourcellservice.com
US Based Carriers:
Alltel =
xxxxxxxxxx@message.alltel.com
AT&T =
xxxxxxxxxx@mms.att.net
Boost Mobile =
xxxxxxxxxx@myboostmobile.com
Cingular (AT&T) =
xxxxxxxxxx@mms.mycingular.com
Einstein PCS =
xxxxxxxxxx@einsteinmms.com
Sprint =
xxxxxxxxxx@messaging.sprintpcs.com
T-Mobile =
xxxxxxxxxx@tmomail.net
US Cellular =
xxxxxxxxxx@mms.uscc.net
Verizon Wireless =
xxxxxxxxxx@vzwpix.com
Virgin Mobile =
xxxxxxxxxx@vmobl.com
...and those wouldn't work, since it'd be unlikely that the person is using those as their "registered" email address.
Perhaps Cyricx can come up with additional allowance to allow for the processing of such SMS or MMS messages.