MailCull blog: field notes on email deliverability and list quality
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.
What Actually Happens When You Send to an Invalid Email Address
One bad address doesn't just bounce. It nudges every subsequent send a little closer to the spam folder.
SPF, DKIM, and DMARC Setup: A Practical Guide With Real DNS Records
The three records, real examples, and the safe rollout sequence.
Role-Based Email Addresses: What They Are and When to Mail Them
A role-based address isn't automatically bad. It just behaves differently than a personal one, and the right call depends on what you're sending.
MX Record Validation: What It Actually Tells You About an Email Address
If the domain has no MX, no mail lands. But a healthy MX record proves less than people think. Here is where the signal stops being decisive.
How to Reduce Your Email Bounce Rate: The Complete 2026 Guide
Bounce rate is a single number with five different causes underneath. Here's how to find yours and fix the right one.
How to Clean an Email List: The Complete Practical Guide
Eight steps. One sitting. The list you start with isn't the list you should send to.
How to Check if an Email Address Is Valid (Step by Step)
One address or ten thousand, the right method depends on what you're going to do with the answer.
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