How to Verify Closed-Lost and Churned Contacts Before a Win-Back Campaign

Verify closed-lost and churned contacts before a win-back campaign: export them from your CRM with the date and the reason for the loss, run the emails through a verifier, send the win-back to valid addresses first and treat invalid ones as a lead to find the new contact. These contacts know your name, which makes them a better list than a cold one. They are also often out of date, because the person you talked to may have left the company since.

Step 1: export with context

Export the closed-lost deals or churned accounts to CSV with at least: contact name, email, company, close date, reason lost and the deal owner. If the CRM holds several contacts per deal, export all of them. The posts on verifying emails in Salesforce, cleaning HubSpot contacts and Pipedrive show the options for each.

Step 2: split by age and reason

Segment	Handling
Lost in the last 6 months	Verify, then send
6 to 24 months	Verify, then send in small batches
Older than 24 months	Verify and treat as a cold list
Lost on price or timing	Strongest win-back segment
Lost to a competitor	Needs a different message

Step 3: clean and verify

Remove duplicates, since one contact often sits on several deals, then upload the CSV on the verify page. Each address comes back valid, risky or invalid with a reason. See how to read a verification report.

Step 4: act on invalid rows

For a consumer list an invalid row is a dead address. For a closed-lost B2B contact it often means the person left.

• Find the replacement. Look the account up and find who holds the role now.
• Flag stale titles. Flag stale job titles in a lead list catches people who moved and kept an address.
• Do not delete the account. The deal context is still useful.

Step 5: send

1. Send valid addresses first, in a small batch.
2. Write for the reason lost, not a generic "checking in".
3. Watch bounce rate and replies for a few days before a second batch.
4. Keep risky rows for a later, smaller batch; see catch-all emails: what to do.

Rules on who you may email still apply: GDPR for B2B cold email is a starting point.

Re-check before the next win-back

A list verified now is a list that decays. If you run win-backs every quarter, verify again before each one.

Next step

Run 100 free checks on your closed-lost export with a Google sign-in, no card. See pricing: Starter is $9 a month for 2,500 emails, one-time packs start at $15 for 10,000 checks, and Pro is $39 a month.