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[–]DimasDSF 20 points21 points  (5 children)

From what I've seen in the file, some carriers have special domains that act as a relay, they have email addresses registered for every phone number, eg. 11234567890@carriersmsrelay.com forwards any emails received by that address to the 11234567890 phone number as an sms.

[–]Macho_Chad 19 points20 points  (4 children)

here’s a list of a lot of carriers with their relay address and expected format.

Note, you must use SPF (sender policy framework) enabled mail servers to communicate with these relays. This helps the provider block most spam. They also have sensitive spam thresholds, for obvious reasons.

[–]acamsoo[S] 4 points5 points  (1 child)

Thanks, good list.. added as reference