For a phone to send a response (reply) to a message, it needs a mobile number to respond to. When you send messages with an alphanumeric sender ID, the receiving phone does not have a mobile number to reply to, and therefore it cannot establish two-way SMS.
Frequently Asked Questions
- Email to SMS – How to fix 550 5.7.520 Access denied, Your organization does not allow external forwarding
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- Does Edgility support international messaging?
- Why can’t SMS recipients respond to messages sent using my ‘company name’ (Alphanumeric sender ID)?
- SMS Length and Message Parts
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