Also known as: do-not-contact list, opt-out list
A suppression list is the record of email addresses you must never send to — people who unsubscribed, marked you as spam, hard-bounced, or are already customers or active conversations. Before any campaign sends, your list is scrubbed against the suppression list so those addresses are automatically excluded. It's both a legal requirement (honoring opt-outs is mandatory under CAN-SPAM) and a deliverability safeguard.
Several categories belong there: anyone who clicked unsubscribe or replied asking to stop, anyone who marked a message as spam, addresses that hard-bounced (they're invalid and re-sending hurts you), and people you shouldn't be cold-emailing at all — existing customers or open opportunities. The list grows continuously as each campaign generates new opt-outs and bounces, so it has to be maintained automatically, not by hand.
Emailing someone who opted out is a CAN-SPAM violation with real penalties, and emailing someone who marked you as spam invites another complaint that damages your reputation. A suppression list prevents both. The reliable approach is software that automatically adds unsubscribes, complaints, and bounces to a single suppression list and scrubs every send against it — so a human error can't accidentally re-contact someone who asked you to stop.
The suppression list is where compliance and deliverability meet. It keeps you on the right side of the law and protects your sender reputation by ensuring you never re-email the people most likely to report or bounce you.
Anyone who unsubscribed or asked to stop, anyone who marked you as spam, addresses that hard-bounced, and contacts you shouldn't cold-email at all such as existing customers or open opportunities. The list grows with every campaign and must be maintained automatically.
Honoring opt-outs is mandatory under CAN-SPAM, and a suppression list is how you do it — by ensuring anyone who unsubscribed is automatically excluded from future sends. It also protects deliverability by preventing repeat complaints and bounces.
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