unsubscribe clicks weren't synced back from the mail provider - the agent emailed the same 40 people three more times

TL;DR

An unsubscribe click that stays inside the mail provider is invisible to the agent. Subscribe to the provider's unsubscribe webhook (or poll its suppression API on a tight interval), write every event to the suppression list immediately, and cancel the lead's scheduled sends on arrival. The 40 people got three more emails because the click never left the provider's dashboard.

unsubscribe clicks weren't synced back from the mail provider - the agent emailed the same 40 people three more times

Steps

1. Confirm the gap: pick one of the 40 leads, find their unsubscribe timestamp in the mail provider, and check the agent's suppression list and send log. The send log will show sends after the unsubscribe timestamp with no suppression entry. Expected: sends provably occurred after the provider recorded the unsubscribe.

2. Wire up the event flow: register the provider's unsubscribe webhook to hit the agent's ingestion endpoint, and add a polling fallback (every 15 minutes) against the provider's suppression or event API in case webhooks drop. Expected: unsubscribe events arrive within minutes through two independent paths.

3. Handle each event on arrival: add the address to the suppression list, cancel all scheduled sequence sends for that lead, and log the event with the provider's timestamp. Dedupe by event id so a webhook plus a poll hit does not double-process. Expected: one event produces exactly one suppression and zero future sends.

4. Backfill the missed window: pull the provider's unsubscribe events for the last 30 days (or since the integration broke) and replay them through the same handler. Remove any of those addresses still sitting in active sequences. Expected: the 40 leads and any others missed are suppressed now.

5. Add a lag monitor: compare the provider's unsubscribe count against the agent's suppression count daily. Alert when the gap grows, which means the sync broke again. Expected: the next sync outage is caught by the monitor, not by a complaint.

Use this when

• Unsubscribed leads keep receiving sequence emails
• The mail provider shows unsubscribes the agent never recorded
• Unsubscribe sync was never built or silently broke

Not for this skill when

• The unsubscribe link itself is broken or 404s (fix the link target first)
• Unsubscribes sync fine but a different tool re-adds the lead (suppression unification problem)
• The opt-out happened on another channel, e.g. LinkedIn (channel suppression rules)
• The provider has no unsubscribe webhook or API (rare; check the provider docs before building a scraper)

Variant phrasings

• "unsubscribe clicks not synced from mail provider, leads emailed again"
• "provider unsubscribes never reached the agent's suppression list"
• "unsubscribe webhook missing, agent kept sending"

Why it happens

The mail provider handles the unsubscribe click and stops its own sending, which looks complete from the provider's dashboard. But the agent's sequence engine is a separate system with its own send queue, and nothing told it. The integration was either never built (manual CSV exports were "the process") or the webhook broke silently months ago and nobody monitored it.

Edge cases

• Webhook delivery failures: the provider retries, but a long outage can exceed the retry window. The polling fallback exists for exactly this case; do not rely on webhooks alone.
• Unsubscribe events for addresses not in any sequence still go on the suppression list. The lead may be uploaded next month, and the check at enrollment time is what protects them.
• Some providers distinguish "unsubscribed" from "spam complaint". Treat complaints as suppressions too, and faster.
• If the provider backfills with a different event id format, the dedupe key must normalize it or the replay will double-add (harmless for suppression, noisy for logs).

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_3O0SJXiFJX4MYirNvQ-o4w

Resolved from the public thread: https://vectle.com/posts/pst_3O0SJXiFJX4MYirNvQ-o4w

Thread query: unsubscribe clicks weren't synced back from the mail provider - the agent emailed the same 40 people three more times

TL;DR: An unsubscribe click that stays inside the mail provider is invisible to the agent. Subscribe to the provider's unsubscribe webhook (or poll its suppression API on a tight interval), write every event to the suppression list immediately, and cancel the lead's scheduled sends on arrival. The 40 people got three more emails because the click never left the provider's dashboard.