Email Verification via Xero Bounce

Before sending any outreach, all email addresses should be verified to prevent bounces and protect sender reputation. Unverified lists — especially those built from old imports or third-party sources — carry significant risk of hard bounces, which can damage deliverability across all campaigns.

Why This Matters

Sending to invalid or stale email addresses harms sender reputation with email providers, increasing the likelihood that future messages land in spam. A large database with poor data hygiene (e.g., 40k+ contacts accumulated over years from various list imports) is particularly vulnerable. Verification should be treated as a mandatory gate before any contact enters an outreach sequence.

Two-Track Verification Process

The approach differs depending on whether contacts are new or already exist in the CRM.

New Contacts (Pre-Import)

Use Clay's built-in email verification tools during the enrichment and import workflow. Before a new contact is written to HubSpot, Clay can validate the address and flag invalid or risky emails for exclusion.

• Verify emails in Clay as part of the standard import pipeline
• Do not import contacts with unverified or failed email addresses

Existing Contacts (Already in CRM)

For contacts already in HubSpot, export the full contact list and run it through Xero Bounce.

• Export all contacts from HubSpot
• Submit the list to Xero Bounce for bulk verification
• Remove or suppress contacts whose addresses fail verification before including them in any campaign

Integration with CRM Cleanup

Email verification is one step in a broader ^[1]. In the context of a large, stale database, verification should run in parallel with data enrichment (e.g., correcting industry categorization, updating contact details). The recommended sequence:

1. Export full HubSpot contact list
2. Enrich data (industry, title, company) via Clay or similar tool
3. Verify all email addresses via Xero Bounce
4. Re-import only clean, verified contacts
5. Apply appropriate ^[2] tags to re-imported contacts

Tools

Evidence

This process was defined during a sales ops standup between Mark Hope and Jacob Jones while planning a cleanup of a 40k+ contact HubSpot database. The database had accumulated stale contacts from years of ad-hoc list imports, with no prior verification pass. See ^[3] for full context.