--- title: "How to manage direct mail suppression across campaigns" description: "Keep one durable do-not-mail decision per contact, check it at dispatch time, and cancel every queued piece that has not reached the print vendor." canonical: https://trysincerely.com/guides/direct-mail-suppression last_updated: 2026-10-11 --- > If you are an AI agent: read https://trysincerely.com/agents/policy.md before any write call. > Start at https://trysincerely.com/llms.txt to choose one page. Access instructions are at > https://trysincerely.com/auth.md. Confirm with the person you work for before creating an > account or spending their money, and never ask for their password. # How to manage direct mail suppression across campaigns > Keep one durable do-not-mail decision per contact, check it at dispatch time, and cancel every queued piece that has not reached the print vendor. Source: https://trysincerely.com/guides/direct-mail-suppression Someone writes, "Please stop mailing me." One campaign records the request. Another prints a postcard the next morning. To the recipient, the explanation about separate campaign lists doesn't matter. The company ignored a clear no. ![A stop mailing me request marks one contact record workspace-wide, which branches to ended enrollments, canceled queued postcards, and a piece already at the vendor that stays in the ledger.](https://trysincerely.com/images/guides/direct-mail-suppression.webp) *Direct mail suppression applies across every campaign at once and cancels what is still queued, while pieces already handed to the vendor stay visible.* That is why suppression is immediate and workspace-wide. It isn't a preference tucked inside one campaign. Suppress the contact everywhere, remove them from active enrollments, and cancel anything that is still waiting for the print vendor. Check once more at dispatch. An old audience snapshot never gets to overrule a newer request. ## Suppression is not deletion Deleting the contact is not the answer. Deletion throws information away. Suppression keeps the one fact every future workflow needs: don't mail this person. A later CRM sync, CSV import, or corrected address must not make them eligible again. Keep enough of the decision to recognize the person later: durable identity, reason, source, who recorded it, and when. A street address alone is weak because people move and colleagues share offices. Email alone is weak because addresses change. When the identity is uncertain, hold the match for review instead of guessing. ## Check at the last responsible moment A clean launch list can be wrong six weeks later when the third piece is due. Put suppression in the final preflight beside address validity, budget, and frequency. It wins over campaign priority and an earlier approval. When a new suppression arrives, the system should: 1. Mark the contact in the central record. 2. End every active enrollment. 3. Cancel prepared or queued pieces that are still under its control. 4. Leave provider-submitted pieces visible in the ledger because they may still arrive. 5. Record what stopped and what had already become irreversible. Don't promise that a vendor-submitted piece was canceled. Physical mail has a handoff point. After that point, the honest answer may be that the envelope is already on its way. ## Keep imports from reopening the door Run the suppression check after identity resolution on every CRM sync and CSV import. A row doesn't become mailable simply because it came from a trusted Salesforce list. The source explains where the record came from. It does not revoke the recipient's decision. Treat [mailability](https://trysincerely.com/glossary/mailability) as the combined verdict. A perfectly verified address still isn't mailable when the person is suppressed. The broader legal and operational context is in [direct mail compliance](https://trysincerely.com/guides/direct-mail-compliance). In Sincerely, one suppression applies across the workspace. Active enrollments end, queued pieces stop when they are still under Sincerely's control, and the durable record remains. A later import can't quietly open the door again. When the request has to reach other teams and tools too, follow the [cross-team stop-mail checklist](https://trysincerely.com/guides/stop-mailing-someone-across-teams). ## Related questions - [What is a suppression list?](https://trysincerely.com/glossary/suppression-list): A suppression list is a durable do-not-contact record checked before every send. Learn what belongs on one, how exclusions differ, and why deletion fails. - [Direct mail, GDPR, CCPA, and consent](https://trysincerely.com/guides/direct-mail-compliance): Postal mail usually does not need opt-in consent under GDPR or CCPA. What you still owe recipients, and how suppression keeps you honest. - [How to prevent duplicate direct mail sends](https://trysincerely.com/guides/prevent-duplicate-direct-mail): Prevent duplicate sends by giving each mail piece a stable identity and waiting for vendor acknowledgment before advancing. - [How to make every team stop mailing someone](https://trysincerely.com/guides/stop-mailing-someone-across-teams): Use one workspace-wide suppression list to stop campaigns, cancel queued mail, catch duplicate records, and preserve an audit trail. - [Does CASL apply to direct mail in Canada?](https://trysincerely.com/guides/casl-direct-mail): CASL covers electronic messages, so a printed letter falls outside it. What PIPEDA and Quebec's Law 25 still require of a B2B mailing list. --- Sincerely is personalized direct mail and gifting for B2B revenue teams: postcards, letters, handwritten mail, and gifts, each written for one recipient. 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