Start of main content

Email Marketing Glossary.

Clear, no-fluff definitions of every email marketing term that matters—from open rates to double opt-in. 

 

Suppression List

A suppression list is a list of email addresses you deliberately exclude from sends — such as unsubscribes, hard bounces, and complainers — to stay compliant and protect your deliverability.

Also known as: exclusion list, do-not-email list

A suppression list is the guardrail that keeps you from emailing people you shouldn't. It quietly enforces unsubscribes and removes problem addresses so a single mistake doesn't damage your reputation or break the law.

Who belongs on a suppression list?

Unsubscribed contacts, hard bounces, spam complainers, known spam traps, and anyone you're legally required not to email. These stay suppressed even if re-imported.

Why do suppression lists matter?

Emailing an unsubscribe or a hard bounce risks legal penalties and reputation damage. Suppression lists automate compliance and protect deliverability across all your sends.

How are suppression lists managed?

Most email platforms maintain them automatically, adding unsubscribes and bounces and checking every send against the list so suppressed contacts are never emailed.

Related terms

Email List Lead Magnet List Segmentation Subscriber Opt-In Form Double Opt-In

Related reading from Drip

The 5-Step Email Scrubbing Framework You Should Follow How (And Why) To Keep Your List Clean (Help Center)

Frequently asked questions

What is a suppression list?
A suppression list is a list of email addresses you deliberately exclude from sends — including unsubscribes, hard bounces, and complainers — to stay compliant and protect your deliverability.
Who should be on a suppression list?
Unsubscribed contacts, hard bounces, spam complainers, known spam traps, and anyone you're legally prohibited from emailing. These remain suppressed even if their addresses are re-imported.
Why are suppression lists important?
Emailing an unsubscribe or a hard-bounced address risks legal penalties and reputation damage. A suppression list automates compliance and protects deliverability by ensuring those contacts are never emailed.
How is a suppression list managed?
Most email platforms maintain it automatically — adding unsubscribes and hard bounces and checking every send against the list — so suppressed contacts are excluded without manual work.
An illustration of a an envelope with a thumbs up.
An illustration of an envelope with an arrow.

Come for the automated marketing. Stay for the endless revenue growth.

Start a 14-day free trial, no credit card required.

Try Drip today