Data compliance and deduplication practices for outbound
For outbound into Europe and North America, three things form the compliance floor: you can state where the data came from, you can delete it on request, and every email carries a working opt-out. Those three avoid most disputes.
Keep provenance
Store a source identifier and acquisition timestamp on every contact record. Being able to state that a record came from a public or licensed source beats reconstructing the explanation after a complaint.
Handle deletion and opt-out
- Maintain a global suppression list fed by both opt-outs and deletion requests.
- Check every freshly enriched batch against the suppression list before it enters the send flow.
- Match the suppression list on both email and domain.
Cross-source dedupe
Multi-source aggregation always produces duplicates. A practical rule set: email as the primary key, domain plus person name as the secondary key, and normalized domain — not name — as the company key. Use name-similarity matching only as a last resort, with manual spot checks.
Try it yourself
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