MailCull blog: field notes on email deliverability and list quality
2026
5 of 5
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 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.
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