I am having the same problem and can replicate the issue. The message must be sent in HTML for the sender's email address to appear as the sender. If the message is sent in plain text, the sms sender is a random 4 digit number.
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I am having the same problem and can replicate the issue. The message must be sent in HTML for the sender's email address to appear as the sender. If the message is sent in plain text, the sms sender is a random 4 digit number.