Glossary / Suppression list
What is Suppression list?
A suppression list is the record of addresses you must never email again: unsubscribes, complaints, and hard bounces. It runs on every send.
When someone unsubscribes, their address goes on the suppression list. So does anyone who marked you as spam, and every address that permanently bounced. Before each send, the platform checks that list and drops those addresses.
It matters most when lists move around. Import a spreadsheet from last year and it can quietly re-add people who already left. The suppression list is what stops that from becoming a complaint.
Never take someone off the list because you think they changed their mind. If they want back in, they can sign up again. That is the only clean way back.
In Creaiter
Creaiter handles suppression and unsubscribes for you, so opted-out contacts are excluded from every campaign and journey automatically.
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