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Data Quality
CRM Data Deduplication: Email, Domain, Person, and Company Keys
November 3, 20267 min read
Deduplication is not deleting similar rows. It is deciding which identity keys are authoritative and how new evidence should enrich an existing record.
AI-powered execution works best when targeting, messaging, and cadence are treated as one connected system.
1
Use layered identity keys
Why it matters: Email, normalized domain, LinkedIn URL, and person identity each solve a different matching problem.
- Use exact email matches for people
- Use domain and LinkedIn for companies
- Treat fuzzy name matches as review signals
2
Merge conservatively
Why it matters: Keep the strongest existing value and add only higher-confidence evidence.
- Never replace a verified email with blank
- Preserve source provenance
- Log rejected or ambiguous matches
Final takeaway
A good merge makes the database richer without making identity less certain.
DeduplicationCRMLead Database