Glossary
What is a suppression list?
A suppression list, also called a do not contact list, holds people who must not be messaged: those who unsubscribed or asked to stop, those who requested erasure, existing customers you exclude, and addresses that bounced. Every send should be checked against it, across every campaign, mailbox and channel, so one opt out stops everything.
Published by Sellinger AI. Numbers and settings checked on 24 October 2026 against the fact register. Report an error.
Who belongs on a suppression list?
- People who unsubscribed or replied asking you to stop.
- People who asked for their data to be erased.
- Customers or partners you do not want to prospect.
- Competitors and your own staff.
- Addresses that hard bounced.
Why must it cover every channel?
Because the person asked you to stop, not a mailbox. Someone who says stop to an email and then receives a LinkedIn message from the same company has been ignored. A team wide list, checked before every send on every channel, is the only reliable way to honour an opt out.
What makes a suppression list fail?
| Failure | Result |
|---|---|
| One list per mailbox or tool | An opt out in one place does not stop the others |
| Manual updates | Opt outs wait days to be added |
| Re-importing old lists | Suppressed people come back as new leads |
| Unclear opt out phrases ignored | People who asked to stop keep getting messages |
How Sellinger handles it
Before every send on email, LinkedIn and WhatsApp, the platform checks the team's suppression list and refuses the send when the contact is on it or when the check cannot be completed. When a contact replies with an opt out such as STOP or unsubscribe, in English, Bulgarian or German among other forms, the contact goes on the team's suppression list, the agent stops and the lead is closed out. A weak or unclear phrase never writes the permanent record: the agent stops and a person decides.
An erasure function takes an email address, phone number or LinkedIn address, anonymizes the matching leads in the workspace and adds the identifiers to the suppression list so the person cannot be imported and contacted again. The opt outs and suppression help article shows where to see and edit the list.
Common questions
Is a suppression list required by law?
Should bounced addresses be suppressed?
Can someone be removed from the list?
Sources and method
Sellinger behaviour from the fact register (suppression, opt out and erasure entries), checked 24 October 2026.
Related: One click unsubscribe, GDPR legitimate interest, Opt outs and suppression, Outreach rules.
