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Your suppression list is your do-not-mail list: addresses Mailr excludes when it builds an audience. Some entries you add yourself, some arrive from your CRM, and some come from homeowners who asked to stop receiving mail. Honoring those requests is both the right thing to do and required — and it keeps your response rates honest by spending postage on people who want to hear from you.

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The Suppression list page

Open Assets → Suppression list in the sidebar. The page reads: “Addresses on this list are excluded from your campaigns. They can still be used as target addresses for nearby campaigns.” That last sentence matters for Neighborhood Reactivation: a past customer’s address can still be the center point you mail around — it just never receives a card itself.

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The two categories

Every row carries one of two badges. The Source column tells you where each row came from: Manual, CSV Upload, Webhook, HubSpot, CRM, CRM Import, Deal Won, and Recipient Opt-Out.
Do Not Contact addresses are never mailed — in any campaign, in any audience mode, including “Send to everyone.” That is the one exclusion nothing overrides.

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Add addresses yourself

The Add address card — “Manually add an address or upload a CSV file” — gives you three ways in:
  • Add one address — type it into the address field (placeholder e.g. 123 Main St, Austin, TX), pick a category — Do Not Contact or Customer — and add optional Notes for your team.
  • Upload a CSV — add many addresses at once, for example a list of existing customers you don’t want mailed.
  • Import from CRM — press Import from CRM to pull your closed-won deals and completed jobs in as Customer rows. Once a CRM integration is connected, new ones are added automatically — see Integrations.
Adding an address to Do Not Contact is the strongest protection available and takes seconds. Do it as soon as a homeowner asks you directly — by phone, at the door, or by email.

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How a recipient opts out

Every postcard carries a unique QR code that leads to that household’s own landing page. The disclosure strip at the bottom of that page links to a Do Not Mail page. It’s public, needs no login, and isn’t indexed by search engines. The page is headed “Stop mail to 123 Main St?” — with the recipient’s own address — and explains:
This removes your address from the mailing list of the business that sent this mail, and from every other business that sends mail through Mailr. It takes effect immediately and applies to future mailings.
The recipient presses Yes, remove my address, and sees “Done.” — “123 Main St has been removed from this sender’s mailing list and from all other businesses that mail through Mailr. You can close this page.” If they change their mind before confirming, closing the page does nothing: “Changed your mind? Just close this page — nothing happens until you confirm.” The address is then kept on the do-not-mail list and used only for suppression, as the page’s footer states.
The link on a postcard’s landing page is the only route to opting out. There’s no page where someone can type in any address they like — that’s deliberate, so nobody can suppress a neighbor’s address.
In your suppression list, that request appears as a Do Not Contact row with source Recipient Opt-Out. You can delete that row from your own list, but the platform-wide suppression stays in place and can’t be reversed by your workspace — the homeowner asked every Mailr sender to stop, and Mailr honors it.

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How “Who to mail” and cooldowns interact

Every campaign and automation has a Who to mail setting: “Choose which exclusion lists to apply when finding neighbors.” Two workspace-wide timers decide how long Customer rows and recently mailed homes stay excluded:
  • Mail cooldown (days) — default 30. How many days before an address can be mailed again.
  • Customer cooldown (months) — default 24. Customers added inside this window are skipped in Standard mode; older ones can be mailed again.
Both live on the Account page — see Workspace settings. Neither one affects Do Not Contact, which is always skipped.
On the Review & Submit step of a campaign, the Suppression list row shows the exact effect — for example “1,240 homes found · 96 excluded”. That’s your suppression list doing its job.

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Next steps

Targeting

How Mailr picks the homes before exclusions run.

Workspace settings

Change your mail and customer cooldowns.

Campaign troubleshooting

Why your audience came out smaller than expected.

Data & privacy

How Mailr handles addresses and opt-out records.