# MSG-054 — Universal opt-out keywords must be supported in copy and configuration

> STOP, END, CANCEL, UNSUBSCRIBE and QUIT must all be supported, both in the keyword configuration and honoured in practice.

- **Rule ID:** MSG-054
- **Layer:** Message content (`MESSAGE_CONTENT`)
- **Checks:** `campaign.optout_keywords`
- **Severity:** BLOCKING — Breaking this rule gets the submission rejected outright.
- **When it bites:** Gates approval — get this wrong and registration is refused
- **How it is detected:** Deterministic (settled in code from the submitted values)
- **Fix type:** Fix the field — a better value in the form clears it
- **Required by:** CTIA, FCC, TCR
- **Applies:** Applies to every 10DLC registration.
- **Canonical URL:** https://ekas.io/rules/10dlc/message-content/msg-054/

## Why this rule exists

These five are recognised at handset and carrier level regardless of configuration, so a consumer using any of them has effectively opted out whether your platform noticed or not. Declaring them aligns your suppression list with what has already happened.

## How to fix it

Add all five universal keywords to the configuration, ideally alongside REVOKE and OPTOUT.

## Example of a compliant value

```text
STOP, QUIT, END, REVOKE, OPTOUT, CANCEL, UNSUBSCRIBE
```