Every political text program has to honor opt-outs instantly, automatically, and permanently. When a voter replies STOP, the messages stop and stay stopped, and when they reply HELP, they get a short identifying response. This sounds trivial and it's where a surprising number of campaigns get exposed, because "we forgot to process an opt-out" is not a defense a plaintiff's lawyer will accept.
How does STOP work?
When a recipient replies STOP, END, QUIT, UNSUBSCRIBE, or CANCEL, the carrier enforces the opt-out at the network level for those standard keywords. But your platform still has to record the opt-out against that number and never message it again, across every campaign that touches the same contact. Carrier-level blocking handles the standard keywords; your own suppression list is what keeps you from re-adding that person on the next import.
What about HELP?
HELP is the companion requirement. A HELP reply should return a short message identifying the campaign and how to get assistance. Both STOP and HELP handling should be built into the platform, not bolted on or handled by a staffer, because the requirement is that they work automatically and immediately, every time.
The opt-out most tools miss
The failure to watch for is the human-worded opt-out. A voter who replies "please take me off this list" or "stop texting me" hasn't typed a magic keyword, but they've clearly asked to leave. A program that only catches literal STOP will keep texting someone who plainly opted out, which is both a violation and a great way to generate a complaint. Good programs read intent, not just keywords, and suppress the number the moment a person asks in any words.
Why opt-out handling is non-negotiable
Opt-outs sit inside the TCPA's core obligations, alongside consent, sender ID, and quiet hours. A mishandled opt-out is a clean, provable violation, the kind a plaintiff looks for, and it's entirely avoidable. It's also a list-health issue: honoring opt-outs cleanly keeps your sender reputation intact, while ignoring them drives complaints that get you filtered. Doing it right protects you on both fronts at once.
Frequently asked questions
What keywords trigger an opt-out?
STOP, END, QUIT, UNSUBSCRIBE, and CANCEL are the standard ones carriers enforce. But you should also honor human-worded opt-outs like "take me off this list," because intent counts, not just the keyword.
How fast do you have to process an opt-out?
Immediately and automatically. It should be built into the platform so a STOP stops messages in seconds and permanently, not by a staffer later.
Do opt-outs carry across campaigns?
They should. Once someone opts out, suppress that number across every campaign that touches the same contact, and don't re-add it on the next import.
Keep reading: the complete TCPA guide and do campaigns need consent to text voters?. For the rules, see the FCC.
This is general information, not legal advice, current as of the date above.