How can a business send one-way SMS messages?
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gentian.violet
What's the best way for a business to send text messages that recipients can read but can't directly reply to, similar to automated notifications from healthcare providers or banks? I'm looking for the usual technical approach and any important considerations, such as sender IDs, short codes, or automatic responses.
Answers
Use an SMS provider such as Twilio or MessageBird. Depending on your country, you can send from an alphanumeric sender ID or a short code, which typically doesn’t support replies. In the United States, common options include a registered short code or a verified toll-free number configured with an automatic inbound response.
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It’s usually better to handle incoming texts than to pretend replies don’t exist. Configure the SMS provider’s inbound webhook to send an automatic response explaining where the recipient should go for help or additional questions. That way, replies don’t disappear without explanation.
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The email-style approach of using a no-reply address doesn’t directly apply to SMS. You need an SMS gateway and a sender type that either prevents replies or routes them to an automated system. Availability and rules vary by country and carrier.
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Bivouac: Some two-factor authentication services also use dedicated short numbers, often with five or six digits, for this kind of one-way notification.