ZapBounce and HubSpot
HubSpot charges by marketing contact, and it marks an address as bounced after a hard failure. Both of those make a dirty import expensive in a way that is hard to unwind later.
The bounced state is the part people underestimate. Once HubSpot sets it, that contact stops receiving marketing email, and reversing it for an address that was only mistyped takes manual work per record.
A bounced contact stays bounced and stays billable
HubSpot flags a contact as bounced after a hard failure and excludes it from marketing email from then on. If the address was a typo made at a form, the real person behind it never hears from you again.
Marketing contacts are the billing unit, and a contact set to non-marketing stops counting at the next renewal rather than immediately. So the dead address you imported in January is on the bill until the cycle turns.
Workflows enroll on contact creation, which means an import can start every enrollment at once. That is the same burst problem other automation platforms have, with the added cost that HubSpot's contact limits are tiered.
How the data moves
Verify before the contact is created
In front of the contacts API, or in front of the import. Anything checked afterwards has already been billed and possibly already enrolled in a workflow.
Store the verdict in a custom contact property
A dropdown property rather than free text, so list filters and workflow branches can read it reliably and a typo in the value cannot break a filter.
Use an active list, not a static one
An active list filtered on the verdict property updates itself as new contacts are verified. A static list is a snapshot that quietly goes stale.
Set invalid contacts to non-marketing
That stops the sending and removes them from the billable count at the next renewal, while keeping the record and its deal history.
Setting it up
- Create a dropdown contact property for the result with its four values (valid, invalid, catch_all, unknown), a checkbox each for the role and disposable flags, and a date property for the check.
- Export existing contacts as CSV with the properties you care about.
- Verify the file and import the results back, matching on email so contacts update rather than duplicate.
- Build an active list filtered on the verdict property for marketing sends.
- Set contacts marked invalid to non-marketing rather than deleting them.
- Add a verification call in front of any integration that creates contacts through the API.
HubSpot: common questions
Can I un-bounce a HubSpot contact?
Individually, in the contact record. There is no bulk API route, which is why verifying before creation matters more here than on most platforms.
Does setting a contact to non-marketing reduce the bill immediately?
At the next renewal rather than instantly. Plan the clean before a cycle turns if the billing matters.
Should the verdict be a property or a list?
A property. Lists are derived from properties, and a property carries the check date that tells you when the verdict expires.
Check a HubSpot export today
100 free checks a month, no card. Unknown results and duplicates are never billed.