HubSpot contact data tends to grow faster than it gets cleaned.
That is how you end up paying attention to the CRM while ignoring whether the underlying addresses are still trustworthy for sending.
Step 1: export the segment you want to review
Start with a CSV export from HubSpot.
You can clean:
- a full contact database
- a specific lifecycle segment
- older marketing contacts
- a segment you plan to email soon
Step 2: run the CSV through MailCull
Upload the export to Verify List and review the status breakdown.
MailCull is useful here because it gives you a simple pre-send view of addresses that are:
- clearly deliverable
- risky enough to review
- clearly undeliverable
Step 3: decide how to act inside HubSpot
You do not have to treat every flagged address the same way.
A practical workflow is:
- exclude undeliverable contacts from sends
- review risky ones before campaign use
- keep high-value CRM history even if you stop marketing to that contact
That keeps the CRM useful without forcing you to keep mailing clearly bad addresses.
Why this matters
Invalid contacts distort the picture in two ways:
- they weaken email performance
- they make the database look healthier than it really is
Cleaning does not solve every CRM hygiene problem, but it improves the quality of the addresses you rely on for sending.
A sustainable rhythm
Quarterly cleanup is a good default for most teams. More often may make sense if you import frequently or work with older B2B data.
The main thing is to stop waiting until bounce rates force the conversation.