A2P 10DLC Campaign Vetting Delays: We are experiencing delays while vetting 10DLC campaigns. Our third party is reviewing campaigns manually, and due to the high volume of requests, a queue has built up. Campaign reviews are expected to take longer. Twilio is working with the provider to help expedite this process. New details will be shared in our incident report as soon they become available.

Error 21610 "The message From/To pair violates..." when sending SMS

The Twilio API will return this message if you attempt to send an SMS or MMS to a recipient who has previously replied to your Twilio number with one of the following keywords:

  • STOP
  • END
  • QUIT

In this scenario, your message would not be sent, and you would not be charged for the message attempt.

Notice: When a user opts out of a phone number that belongs to a Messaging Service, the user is also opted out to receiving all messages sent from that particular Messaging Service.

In order to successfully send messages to such recipients, they must opt in to your messages by texting your number with one of the following keywords:

  • YES

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