MailCull blog: field notes on email deliverability and list quality
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.
How Often Should You Clean Your Email List? (Cadence by Sender Type)
Quarterly for most. Monthly for daily senders. Every campaign for cold outreach. Why the math works out that way.
Free vs Paid Email Verification: When Each One Is the Right Call
Free vs paid is about volume + integrations, not engine quality. Most vendors don't tell you that.
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