December 08, 2025
HubSpot stops your email campaign after 236 sends. Bounce rate: 31,6%! Michel and Johan explain why HubSpot blocks mailings, how to prevent it, and which tools keep your database clean.Why HubSpot blocks your emails
When a lot of your emails bounce, HubSpot automatically stops your campaign. This protects your sender reputation and prevents your domain from being blacklisted. Common after data migrations from platforms like Mailchimp.
Quick fix: Email validation tools
Use affordable HubSpot marketplace tools like NeverBounce, ZeroBounce
or Kickbox. They validate addresses and add custom properties in HubSpot for easy list building.
Monitor with HubSpot's built-in tools
- Email Health (Marketing - Email Health)
- Tracks open rates, bounces, unsubscribes, and spam reports over time.
- Delivery insights (new)
- Shows monthly metrics and mailbox provider breakdown (Outlook, Google, spam filters).
Ensure your domain connection, DKIM, and SPF records are properly configured. Add in DMARC.
Bottom line
Always validate email addresses before importing into HubSpot—especially after migrations. Use validation tools + HubSpot's monitoring to maintain strong deliverability.
** This conversation is recorded in our native language (Dutch) to preserve the natural flow and authenticity of our conversation. You can switch between Dutch and English captions by clicking the CC button in the video player.
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