How should we manage Kickbox deliverable, risky and undeliverable contacts in HubSpot?

Marketing & Content Hub Email Deliverability
1

Hi HubSpot Community,

I’m looking for advice on the safest and most practical way to manage email-verification results inside HubSpot.

We have recently run part of our contact database through Kickbox. Our records are now divided into categories including:

- Deliverable

- Risky

- Undeliverable

- Unknown or inconclusive results

We want to protect our sender reputation, but we also do not want to automatically delete useful company and contact records simply because an existing email address is no longer usable.

Our data may include a mixture of older CRM records, contacts obtained through business-data providers, event contacts, previous campaign records and contacts that require further enrichment or verification.

Our current thinking is:

- Keep deliverable contacts, subject to the correct marketing permission and use case.

- Suppress undeliverable addresses from all email sending.

- Keep the underlying person and company record where it still has business value.

- Research or enrich undeliverable records to find a current role, company or replacement email address.

- Treat risky and unknown results separately rather than automatically including them in normal campaigns.

- Reverify data before major campaigns or after a defined period.

We had initially considered testing some of the risky data in small groups to see what delivered. However, I am concerned that using live sending as an email-verification method could create unnecessary bounce and reputation risk.

I would appreciate guidance on the following:

1. Do you permanently suppress every Kickbox “undeliverable” result, or do you recheck it through another provider first?

2. How do you handle “risky” contacts, particularly accept-all domains where the server may accept an address without confirming that the individual mailbox exists?

3. Do you distinguish between different risky reasons, such as accept-all, disposable, role-based, low-quality or mailbox-full results?

4. Should risky contacts ever be tested through one-to-one sales outreach, or is it better to enrich and reverify them before any email is sent?

5. How do you manage “unknown” verification results?

6. What Kickbox information do you store as HubSpot contact properties? For example:

  • Verification result

  • Verification reason

  • Verification date

  • Verification provider

  • Previous email address

  • Data source

  • Suppression reason

7. Do you use active lists and workflows to automatically prevent risky or undeliverable contacts from entering marketing campaigns or Sequences?

8. How frequently do you reverify your database: before every campaign, monthly, quarterly, annually or based on the age of the record?

9. Would you recommend working through the database month by month using enrichment tools to find updated information, or is there a more efficient process?

10. How do you deal with contacts who have a deliverable email address but no clear evidence of marketing permission?

11. Do you keep deliverable-but-unengaged contacts as marketing contacts, convert them to non-marketing contacts, or suppress them until there is a stronger reason to contact them?

12. What metrics or thresholds do you use when testing a newly cleaned or reverified segment?

13. How do you stop invalid data from being added again through imports, integrations, data providers or manual contact creation?

Ideally, we would like HubSpot to remain the central record for the person, company, verification status, outreach history and suppression status, even when the email address itself is no longer valid.

I would be interested to hear how other teams have structured this and whether anyone has built an effective HubSpot workflow or data-governance process around Kickbox results.

2

Hi @liamthomas,

Happy to help here.

We had initially considered testing some of the risky data in small groups to see what delivered. However, I am concerned that using live sending as an email-verification method could create unnecessary bounce and reputation risk.

If you want to test this, I’d recommend sending a list to both valid and some risky contacts, e. g. 80% valid contacts, then 20% risky ones. If you add these as separate lists in your email send, you can later analyze the performance for each, gauging how risky it is actually to include risky contacts.

To your questions:

  1. If you have the budget, you could run the same list through another provider to compare results. Generally, I trust the validation results of the tool I’m using, especially if it offers multiple rounds of validation like for example Verifalia. You’ll never have 100% confidence in the results so it’s a matter of finding a compromise.
  2. If you can afford to exclude them, exclude them. If they make up 50% of your list, test if you can include them without running into excessive bounce rates.
  3. This depends on the volume in the database. Certainly something I would do if we’re talking of thousands or tens of thousands per bucket. Not a good use of time if we’re talking about less than that.
  4. For valuable contacts, yes, that’s a reasonable way to approach this.
  5. Treat like risky.
  6. Validation date and result are the absolute minimum, more can be useful for exploratory analysis.
  7. Yes.
  8. For contacts that are on regularly used segments, only before big campaign sends. If you have contacts that might not receive emails for months, then before those sends.
  9. Depends on how valuable those contacts are, especially in B2B it might make sense to do so, yes.
  10. Talk to your legal team. They will let you know how exactly you can work with these contacts within the legal boundaries set in your country / markets.
  11. Convert to non-marketing until there’s a reason to contact / re-engage.
  12. The HubSpot email health benchmarks are great for this: Monitor email sending reputation with the email health tool
  13. Restrict permissions to add data through these sources to a small, well-trained team + monitor through reports.

Best regards!

4

Hi @liamthomas Managing email verification data without destroying historical CRM context is a very common challenge, especially when dealing with older lists and mixed data sources.

Your instincts are exactly right: you should not delete the underlying contact or company record just because an email is undeliverable. The historical activity and company association hold too much business value.

At ElanceMind, we frequently build data-governance structures for B2B teams dealing with this exact issue. Rather than going through all 13 points here, here is the high-level framework we implement to solve this safely:

  1. Custom Properties over Deletion: We map Kickbox results (Status, Reason, Date) directly into custom HubSpot properties on the contact record.

  2. Global Suppression Lists: Instead of manually deleting, we use active lists that automatically pull in “Undeliverable” or specific “Risky” contacts. We then use those active lists as global exclusion filters in all marketing email campaigns and workflows.

  3. Enrichment Routing: “Unknown” or high-value “Undeliverable” contacts are automatically routed to a specific view for the sales team to enrich manually via LinkedIn or a tool like Apollo before any 1-to-1 outreach is attempted.

I would be happy to chat through the specific nuances of your remaining questions if you’d like to bounce some ideas around!

Best regards,