MailCull blog: field notes on email deliverability and list quality
How to Detect Disposable Email Addresses
Why disposable addresses fool naive validation, and how to catch them before they pollute your list.
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 Clean Your Email List in Klaviyo
A complete Klaviyo list-cleaning workflow: what verification actually covers, how to handle results, and when to do it.
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.
How to Clean Your Drip Email List
A practical Drip list-cleaning workflow: SMTP verification, the ecommerce billing angle, and what to do with the results.
How to Clean an Email List in ConvertKit (Kit)
For creators and newsletter operators, the list is the channel. Here is how to verify it properly.
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