// Guide
Building and Honoring a Suppression List
Last verified · 2026-06-24
The short answer
A suppression list holds every contact you must never message again: unsubscribes, opt-outs, bounces, complaints, and deletion requests. Scrub every new send against it before export, and propagate additions fast so a fresh opt-out is honored on the next batch. Trackyr supports sub-minute suppression so a request blocks the contact across pulls before your next campaign sends.
What a suppression list is
A suppression list is the inverse of a lead list: it's everyone you're forbidden to contact. It supports your compliance posture, protects your sender reputation, and protects the people who asked to be left alone. It's not optional infrastructure. (This is operational guidance, not legal advice — consult counsel for your specific obligations.)
What belongs on it
- Unsubscribes and STOP/opt-out requests.
- Hard bounces and known-invalid addresses.
- Spam complaints.
- Deletion / erasure requests (DSAR).
- Do-Not-Call and Do-Not-Email entries.
Scrub before every send
A suppression list only works if it runs before export, every time. The dangerous pattern is pulling a fresh list from a new source and forgetting to scrub it against suppression — which re-imports the exact people who opted out.
Speed of propagation matters
If suppression takes hours to take effect, you can message someone after they opted out. That's both a compliance failure and a trust failure. Fast propagation closes that gap.
Never override suppression
- Treat suppression as permanent unless the contact re-opts in.
- Don't 're-add' a suppressed contact from a new data source.
- Keep the list portable so it travels with every campaign.
More on this topic: Compliance →
// Common questions
Answered.
How fast must an opt-out take effect?+
As fast as possible — ideally before your next send. Trackyr's sub-minute suppression propagates the request quickly so a suppressed contact isn't messaged again.
Can a suppressed contact ever come back?+
Only if they re-opt in voluntarily. You should never re-add a suppressed contact from a new data source.
Does suppression apply across sources?+
It should. A suppressed contact must stay suppressed even when they appear in a fresh pull from a different source.
Put it into practice.
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