Perhaps T-mobile could make a list of email addresses that are always allowed to send to each phone number. For example, it has an email address associated with each T-mobile account. T-mobile could also allow each customer to add addresses to that list. Using technology like SPF and DKIM it could verify that an email’s envelope sender domain matches the actual network mail exchanger from which it was sent. Just an idea. As a long-time customer, I appreciate the tmomail.net service, when it works.
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