MailCull blog: field notes on email deliverability and list quality
Can You Verify an Email Address Without Sending One?
Five check layers, in plain English, with the limits of each.
How to Check if Your Domain or IP Is on an Email Blacklist
How DNS blacklists work, which ones matter, and how to check and get off them.
How to Check Email Deliverability for a Domain
The five signals that decide whether your mail lands, and how to check them in one pass.
How to Check if a Domain Is Catch-All
Why catch-all domains defeat naive verification, and how to detect them honestly.
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.
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