> They were using email -> sms specifically which is a relatively new feature that allows you to text mobile devices on carriers that support email to SMS.
I don't think this is true? In ye olden days of text messages, SMS and MMS were relayed via email, IIRC. I remember emailing pics to a friends phone using the MMS email address. The format was unique to each carrier but included the phone number, obviously.
I used to annoy my friends by sending emails to their sms email address (1234567890@vtext.com or whatever) using open email relays. You could spoof the sender name as whatever you wanted and most sms clients would just show that.
I don't think this is true? In ye olden days of text messages, SMS and MMS were relayed via email, IIRC. I remember emailing pics to a friends phone using the MMS email address. The format was unique to each carrier but included the phone number, obviously.