HubSpot Email validation failed vs Not a valid email address
Your newsletter is ready. You click Schedule, and HubSpot answers with a red banner: Error: Email...
KOALIFY BLOG
HubSpot Data Quality & Deduplication Blog
Practical guides, best practices, and tutorials on HubSpot deduplication, duplicate management, bulk merging, and CRM data quality. Learn how to find, manage, and remove duplicates in HubSpot across contacts, companies, deals, and more.
Sent, delivered, dropped, bounced: HubSpot email statuses explained
A sales rep messages you: "Our biggest prospect says they never got the webinar invite." You open...
The HubSpot email health tool: what your score means and what it misses
Your HubSpot email health score dropped from 8 to 6 last month. Is that a subject-line problem, a...
What graymail is, and how it quietly kills HubSpot deliverability
Nobody complains about your monthly product update. Nobody reports it as spam, and hardly anyone...
UNBOUND 2026: people, talks and a $1,000 pin hunt
Two weeks on, and we're still buzzing from Boston.
UNBOUND 2026 was the first edition under its new...
Unengaged contacts in HubSpot: why sending to them hurts everyone
Someone on your team wants the whole database in the monthly newsletter. It's 80,000 contacts....
Building for HubSpot: What We Learned Listing Two Apps in the Marketplace
You've built the app, the OAuth flow works, and you're ready to submit. Then the review comes back...
HubSpot sender reputation: what it is, how to check it, and how to rebuild it
Your newsletter used to get a 30% open rate. The last three sends came in at 14%, 11% and 12%....
How to validate imported emails in HubSpot before they hit a list
You've just imported a list into HubSpot. Maybe it came across from your old CRM during a...
Catch-all, role-based, disposable: what your HubSpot email validation results actually mean
You finally ran a validation pass over your HubSpot list, and now you're looking at a column of...