MailCull blog: field notes on email deliverability and list quality
How to Check a DMARC Record (and What the Policy Means)
Read your DMARC policy, understand none vs quarantine vs reject, and check it in seconds.
How to Check a DKIM Record (and Why It Fails)
Find your DKIM selector, read the key, and figure out why signing is failing.
How to Check Your SPF Record (and Fix Common Errors)
Read your SPF record the way a receiving server does, and catch the errors that cause soft fails.
How to Check MX Records for a Domain
What MX records are, how to read them, and what their absence tells you about an address.
How to Verify an Email Address
The few ways to verify an address, what each proves, and where to go deeper.
The AI read: a plain-English second opinion on every verdict
Every MailCull verdict is deterministic. But when you want the why in plain English, the AI read explains the same signals and tells you what to do next, without ever overriding the engine.
How to Import a Clean Email List Into Brevo (Sendinblue)
Cleaning before import is smarter than discovering problems after the send. Here is the full Brevo workflow.
Apollo Email Verifier: Pre-Send Cleaning for Outbound Lists
Why Apollo's built-in verification isn't enough for cold outreach, what proper SMTP verification covers, and a workflow for cleaning Apollo exports before sending.
Email Verification for lemlist: A Workflow Guide
A complete verification workflow for lemlist users: what SMTP and M365 checks cover, how to handle risky addresses in an agency context, and the step-by-step process.
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