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Email List Supplier Checklist: Evidence, Fields and Delivery
A supplier review should establish what a delivery contains and whether it fits a defined workflow. Start with requirements you can inspect. A large count, a long company history or a broad accuracy label cannot replace that review.
Write a usable specification
Identify the target organisations or audience, required geography and essential fields. Define what each location field means and which job responsibility matters. State whether missing optional fields are acceptable. Agree the duplicate rule and whether repeated contacts at one organisation are expected.
Ask how claims are established
Request the source types, collection or update dates and the checks behind a verification label. Separate address syntax and domain/MX checks from individual mailbox verification and marketing permissions. An inconclusive technical result should remain distinguishable from a confirmed failure.
Review delivery and exclusions
Agree file format, encoding, column names and the process for applying relevant suppression information. Clarify access controls and how the file will be transferred. Check your intended sending platform’s acceptance policy before import. Mailchimp’s audience requirements prohibit third-party lists; supplier assurances do not change that rule.
Set a review and correction process
Compare a representative sample with the written specification and record discrepancies. Define how a disputed field, duplicate or source issue will be investigated. Keep the order specification and delivered version together. Evaluate the supplier by evidence and the response to a concrete issue, rather than an automatic rule that a certain age, rating or telephone-answering arrangement proves quality.