Email validation helps protect your sending reputation by ensuring you only use valid, deliverable business emails. Knock2 is intentionally designed to validate emails at the exact moment you need them, rather than relying on stale or outdated validation data.
This “last-mile” approach helps prevent bounces, spam flags, and domain issues while keeping credit usage efficient.
Why Email Validation Matters
Invalid or risky email addresses can lead to:
Higher bounce rates
Spam filtering or domain blocking
Poor deliverability and reputation damage
By validating emails right before you use them, Knock2 ensures your data stays fresh and reliable.
How Email Validation Works in Knock2
Email validation is available in two places:
Manual validation from the Contacts tab
Automatic validation inside Workflows
Option 1: Validate Emails from the Contacts Tab
You can manually validate individual business emails directly from the Contacts tab.
How it works
Navigate to Contacts
Locate a contact with a business email
Click the circular validation icon next to the email address
Knock2 validates the email in real time
Validation results
Green checkmark: Email is valid
Red X: Email is invalid
You can hover over the icon at any time to see the validation status.
Validation duration
Validation results persist for a limited period (typically 7–30 days)
After expiration, the email can be re-validated if needed
Option 2: Automatically Validate Emails in Workflows
Knock2 also supports automatic email validation inside Workflows.
Where to find it
Create or edit a Workflow
Choose Contacts as the source
Proceed to the Enrichments step
Enable email validation
Toggle on Validate Emails
Knock2 will automatically validate each business email before continuing
What happens if an email is invalid
Invalid or unverified emails are skipped
Skipped records will not be sent to downstream outputs
Example:
If your workflow output is HubSpot, contacts with invalid emails will not be created in HubSpot.
Summary
Email validation is designed for real-time, last-mile accuracy
Validate manually from the Contacts tab or automatically in Workflows
Invalid emails are clearly marked and can be excluded from downstream actions
If you have questions about credit usage, workflows, or validation behavior, reach out to support and we’ll be happy to help.