Someone unsubscribed. A week later you mailed them again.Someone unsubscribes from your newsletter. A week later, you accidentally mail them again. Now they're annoyed, and you might be on the wrong side of the law. A suppression list is the one thing that stops this from happening.
⬡ title-card, text builds: "do not send" stamped over an envelope that gets blockedSo what is it? A suppression list is your "do not send" register. It's a list of addresses you should never mail again, and your sending platform enforces it. Once an address lands on there, your emails simply won't go out to it.
⬡ record-cards, four cards flip face-down under a "DO NOT SEND" banner: unsubscribes · complaints · hard bounces · flaggedFour kinds of addresses end up here. People who unsubscribed. People who hit the spam button. Hard bounces, mailboxes that don't exist. And anyone you've manually flagged as off-limits. Different reasons, same rule: don't send.
⬡ checklist, four items check off: unsubscribed · complained · hard-bounced · manually flaggedHere's why this isn't optional. Rules like CAN-SPAM in the US and GDPR in Europe require you to honor an unsubscribe. Once Captain Kraken asks out, keeping him on your send list isn't just rude, it can mean real penalties. The suppression list is how you prove you respected that.
⬡ split-compare, LEFT "Honored the opt-out" (calm, green) vs RIGHT "Ignored it" (fines / complaints stacking)If this is clearing things up, subscribe. We're working through every list-hygiene question, one at a time.
⬡ title-card, "Subscribe, one question at a time"The second reason is reputation. Mailbox providers watch whether you keep hitting people who already said no. Keep mailing unsubscribers and complainers, and they'll quietly push more of your mail toward the spam folder. Your suppression list is the guardrail between sending volume and staying trusted.
⬡ gauge-meter, needle holds steady in green while suppressed addresses get filtered out before the sendSo a suppression list is simple: it's the list of people you must never email again. It keeps you compliant, it keeps your reputation intact, and it means you only reach people who actually want to hear from you.
⬡ title-card, "Suppression list = your do-not-send register"Next up: exactly which addresses belong on that list, and which ones don't. Subscribe so you don't miss it.
⬡ end-card, Subscribe + Next: "What goes on a suppression list" (005.005.002)What is an email suppression list? It's your do-not-send register: the addresses you should never mail again. This video covers what goes on it (unsubscribes, spam complaints, hard bounces, manually flagged addresses), why it's a legal requirement under CAN-SPAM and GDPR to honor unsubscribes, and how it protects your sender reputation so mailbox providers keep trusting you.
Chapters:
0:00 The problem it solves
0:20 The plain-English answer
0:40 What goes on it
1:05 Why it matters: the law
1:35 Why it matters: your reputation
Next: What types of addresses belong on a suppression list → [link 005.005.002]
Full written guide → reviewmyemails.com/emailalmanac/list-hygiene/suppression/what-is-an-email-suppression-list
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