Source note · Business texting and 10DLC registration
After a recipient opts out, Twilio blocks further messages from that sender to the number and returns error code 21610.
Checked 2026-09-25
- Vendor
- Twilio
- Product
- Messaging Services
- Subsystem
- Opt-out handling
- Deployment
- multi-tenant
- Region
- us
- Release range
- current as of 2026-09-25
- Checked
- 2026-09-25
Sources
- Advanced Opt-Out for Messaging Services — Twilio · tier 2 current vendor documentation · How opt-out blocking works
Cite this note
APA
WarmTransfer. (2026, September 25). Business texting and 10DLC registration: source note business-texting-10dlc-twilio-21610. WarmTransfer. https://warmtransfer.net/knowledge/claims/business-texting-10dlc-twilio-21610
BibTeX
@misc{warmtransfer-claim-business-texting-10dlc-twilio-21610,
title = {Business texting and 10DLC registration: source note business-texting-10dlc-twilio-21610},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/business-texting-10dlc-twilio-21610},
note = {Source note business-texting-10dlc-twilio-21610, checked 2026-09-25}
}