MailCull blog: field notes on email deliverability and list quality
Email Verification and GDPR: What Is Lawful When You Clean a List
An email address is personal data. Verifying it is processing. Here is what that means.
How to Choose an Email Verification Service
Ignore the accuracy claims. Here is what actually separates these tools.
Stop Bad Email Addresses at the Signup Form
Cleaning is repair. This is prevention, and it costs less.
Email List Decay: How Fast Your List Rots and What to Do About It
Roughly 2% a month, but the range is wide and the drivers are predictable.
Bulk Sender Requirements in 2026: What Gmail, Yahoo and Microsoft Now Enforce
The 0.3% spam ceiling is the rule everyone quotes. The list-hygiene requirement is the one that catches people.
The Real Cost of a Dirty Email List (With the Actual Math)
Four costs, three of them invisible. Here is the arithmetic.
Why Are My Emails Bouncing? A Diagnostic Walkthrough
The bounce report has the answer. You just need to read the codes.
What Is a Spam Trap? Types, Risk, and How to Stay Off Blacklists
Pristine, recycled, typo: three types of spam trap, three different signals about your list hygiene.
What Is a Disposable Email Address? (And Why They Distort Your List)
A disposable address isn't a fake address. It's a real one nobody's ever going to read.
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