A 30–90 minute prevention checklist
Start with these practical steps you can run through in one session. Each item is deliberately low‑effort and keeps your team nimble.
- Normalise identifiers: trim and lowercase emails, strip formatting from phones, normalise UK postcodes (AB1 1AA → AB11AA). Use email + phone or email + postcode as a simple canonical key for contacts; for companies use domain or a normalised company name.
- Add form- and import-side validation: require and validate a primary identifier (email or phone), add a second confirming field where needed, and reject obviously malformed rows or show a preview for manual approval.
- Gate imports: load incoming CSVs or integration batches into a quarantine list first; use a quick pre-import dedupe (exact match then simple fuzzy rules) and only commit after review.
Form and import validation you can add today
On forms, validate and normalise as close to the source as possible. Lowercase+trim email inputs, phone inputs limited to digits with country code prompts, and a postcode field with a simple UK pattern check stop many duplicates before they exist.
For imports, add a preview step: reject rows with missing canonical keys, flag probable matches (same email, similar name + postcode) and require a human to confirm merges or new records. These principles work in HubSpot, Salesforce, Marketo or Pardot — the platform differs, the operational rule is the same: normalise early, validate often, and gate writes.
Lightweight dedupe, quarantine and monitoring (so duplicates are caught early)
Keep the process lightweight: run a pre-import dedupe that does exact email/phone checks then one pass of fuzzy matching (name + postcode, name + company domain). Put uncertain matches into a quarantine sheet or smart list and let a person clear them in batches.
Add a simple daily/weekly monitor: a saved view or list for "new records with same email/phone as an existing record" and a short ownership rule (who checks the queue). This gives small teams on the South Coast or in Fareham, Hampshire, a fast feedback loop without heavy engineering.
If you want a short, local implementation plan or hands‑on help setting up the quarantine and monitoring rules, see our CRM and marketing data optimisation service in Fareham: [crm-marketing-data-optimisation-fareham.html]. Optira can help get the checklist applied quickly and practically.