Why Email Suppression Must Follow Contacts Across Campaigns

Why it matters: A recipient can unsubscribe after a campaign is scheduled but before the worker sends. Import-time checks alone cannot cover that change. Apply the authoritative suppression state immediately before each eligible attempt, including follow-ups. Keep the suppression reason so users can distinguish an opt-out from a malformed address or a delivery failure.

• Recheck scheduled recipients when they run.
• Apply the same rules to retries.
• Keep reasons and timestamps traceable.

Why it matters: When duplicate contacts are combined, do not overwrite an opt-out with an incoming blank preference. Reimporting the same address under a different company name should not restore eligibility. Normalize addresses consistently and define workspace or account scope explicitly. The correct scope should reflect the product's audience relationship and applicable requirements, not whichever list happens to be open.

• Do not treat missing consent as renewed permission.
• Retain suppression on dedupe.
• Keep administrative changes auditable.

Why it matters: A campaign with suppressed recipients should show skipped counts rather than look stuck or report a mysterious send failure. Do not expose another customer's private suppression history. Give the sender enough information to understand their own campaign and avoid offering a casual bypass that defeats the protection. Audience size and sendable audience size are different numbers.

• Show audience and eligible-recipient counts separately.
• Never retry a recipient simply because it was skipped.
• Review repeated suppression hits in imported sources.