Understand suppressions, hard bounces, complaints, and global opt-out
See how K2Mailer applies list-specific and tenant-wide delivery protections using a most-restrictive-wins approach.
Protection layers
- List-specific suppression
- Blocks an exact email or supported domain scope for the applicable list without automatically changing unrelated list memberships.
- Tenant-wide suppression
- A broader delivery block that applies across the tenant when no narrower list context is used.
- Hard-bounce history
- Permanent bounce evidence checked by preflight, campaign preparation, and live-send eligibility.
- Complaint evidence
- Spam or abuse-report protection that remains authoritative even if a list membership otherwise appears subscribed.
- Global marketing opt-out
- An explicit contact-level choice to stop marketing across lists. K2Mailer also records a global suppression backstop while preserving list membership history.
Most restrictive state wins
A Subscribed membership does not override a complaint, hard bounce, global opt-out, or applicable suppression. K2Mailer keeps those protections sticky across imports, list attachment, segment resolution, and campaign delivery.
A normal preference-center unsubscribe is membership-scoped in the current canonical system, so opting out of one list does not automatically opt out of every list. The global marketing action is separate and explicit.
Restoring consent is deliberate
Deleting a suppression row does not automatically clear the contact-level global marketing opt-out. If the recipient has explicitly asked to receive marketing again, an administrator can use the dedicated clear-global-opt-out plus membership-resubscribe workflow.
That workflow refuses to clear the global opt-out while complaint or hard-bounce evidence remains. A double-opt-in membership returns to Pending DOI and still requires fresh confirmation.
Do not weaken compliance state to make an audience larger
Suppression, complaint, hard-bounce, unsubscribe, and DOI rules are safety controls, not campaign filters to switch off for a one-time send.
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