Skip to content

Sign in Start for free Dashboard

Field notes · ~1 post / week

Writing about sending, deliverability, and the rules providers actually enforce.

Practical guides, post-mortems from real sends, and plain-English explanations of why your list quality is doing what it is doing. No fluff, no AI slop, no gated PDFs — just our working notes.

2026

Newest first · 9 of 23 shown

How to Verify an Email Address (Without Sending One)

The four checks that tell you whether an address is real, and how to read the result.

email-validationdeliverabilityverify-email

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.

driplist-cleaningverify-list

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.

convertkitkitcreators

How to Clean Your Constant Contact Email List

Constant Contact has strict bounce and engagement thresholds. Cleaning before the send protects your account and improves results.

constant-contactlist-cleaningverify-list

The AI read: a plain-English second opinion on every verdict

Every MailCull verdict is deterministic. But when you want the why in plain English, the AI read explains the same signals and tells you what to do next, without ever overriding the engine.

aiemail-validationdeliverability

How to Import a Clean Email List Into Brevo (Sendinblue)

Cleaning before import is smarter than discovering problems after the send. Here is the full Brevo workflow.

brevolist-cleaningverify-list

How to Export and Clean Your ActiveCampaign Email List

A complete ActiveCampaign list-cleaning workflow: what to verify, when to do it, and how to act on the results.

activecampaignlist-cleaningverify-list

Apollo Email Verifier: Pre-Send Cleaning for Outbound Lists

Why Apollo's built-in verification isn't enough for cold outreach, what proper SMTP verification covers, and a workflow for cleaning Apollo exports before sending.

apollocold-outreachlist-cleaning

Email Verification in Clay: Adding the Receipts to Enrichment

Clay gives you enriched email data. MailCull gives you the receipt. Here's how to add SMTP verification to your Clay workflow.

claycold-outreachlist-cleaning