Suppression List
A suppression list is the registry of phone numbers that have revoked consent. Senders must check this list before every outbound send to remain TCPA-compliant.
A suppression list is the canonical record of phone numbers that have opted out of receiving SMS from a given sender. It is the operational backbone of TCPA compliance.
Best-practice suppression lists are:
- Synced automatically from STOP/unsubscribe events.
- Checked at the platform layer before every send.
- Per-brand (a number that opts out of Brand A doesn't necessarily opt out of Brand B).
- Exportable to all downstream tools (CRM, ESP, dialer).
Tools like OptInFix sync suppression list events back to your CRM via webhook in real time.
Related glossary terms
Under TCPA, consumers can revoke SMS consent at any time by any reasonable means. Senders must honor the revocation — typically by adding the number to a suppression list — within 10 business days.
The Telephone Consumer Protection Act is a US federal law (47 U.S.C. § 227) that restricts marketing calls and texts to mobile phones, with statutory damages of $500–$1,500 per violation.