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Cross-Client Contact Conflict & Dedup System
A single source of truth that stops multiple clients from messaging the same prospect.
Challenge
The client, a marketing agency running campaigns for multiple clients at once, had no system in place to prevent the same contact from being messaged by two different clients simultaneously — risking a poor prospect experience and duplicated outreach across accounts.
Resolution
- Built an N8N automation that checks every contact against a master Airtable database before any campaign message is sent
- Automatically blocked sends to contacts flagged as conflicts
- Alerted the team in real time via Slack whenever a conflict was detected
- Marked clean, conflict-free contacts as “queued” in Airtable to prevent future duplication
Impact
- Eliminated the risk of cross-client contact overlap by checking every send against a master database
- Ensured no duplicate outreach ever reaches a prospect, with conflicts flagged to the team in real time
- Gave the agency a single source of truth across all client campaigns going forward
Stack
Tools used: N8N, Airtable, Slack
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