MailCleanup

Email Verification & Growth Insights

Master list hygiene, boost email deliverability, and optimize your outreach campaigns with actionable guides.

What Is Email Verification? Methods, Result Types & The Real Benefits Explained

What Is Email Verification

Search “what is email verification” and you’ll land on two different topics wearing the same name. Half the results explain the confirmation link a website emails you after signup, the one you click to prove the account is really yours. The other half explain something else: checking a list of addresses you already have to … Read more

What Is Email Deliverability? Why It Matters, Best Practices & Factors You Can/Can’t Control

What Is Email Deliverability

You send a campaign. It doesn’t bounce. Your dashboard says delivered. And still, fewer people are opening it, and you have no idea why. Every guide that talks about what is email deliverability hands you the same list: authentication, sender reputation, engagement, list quality, content, infrastructure. What almost none of them tell you is that … Read more

Ecommerce Email Marketing: What to Send, When to Send It & Why Some Lists Never See the Inbox

Ecommerce Email Marketing

Automated flows make up about 2% of the emails an ecommerce store sends. Omnisend’s own 2026 data puts their share of total email revenue at 37%. That gap is the entire story of ecommerce email marketing, and most guides on the topic never explain it. They hand you a list of eight or nine flow … Read more

What Is BIMI? How It Works, Its Record Syntax & Why Your Logo Still Might Not Show

What Is BIMI

You did everything the setup checklist told you to do. SPF passes. DKIM passes. DMARC sits at p=reject. You published a BIMI record with a valid logo and a certificate from a real issuer. And the logo still isn’t showing up next to your emails. Maybe it shows in Gmail but never in Apple Mail. … Read more

What Is DKIM? How It Works, Its Full Record Syntax & What Actually Breaks the Signature

What Is DKIM

Search what is DKIM and most explainers will tell you it survives forwarding in a way SPF doesn’t. Then they stop there, as if that settles the question. It doesn’t. DKIM signs the body and a defined set of headers, and that signature holds up through simple relaying. Simple relaying means one mail server passing … Read more

What Is Sender Policy Framework? How SPF Works, Its Full Record Syntax & the 10-Lookup Limit That Actually Breaks It

What Is Sender Policy Framework

Most Sender Policy Framework records don’t fail because someone typed the syntax wrong. They fail because a team added a fourth or fifth sending tool well after the record was set up. Nobody recounted what that now costs in DNS lookups, so the record quietly crossed a limit that has nothing to do with spelling. … Read more

How To Read DMARC Reports: Aggregate, Forensic & What Neither One Tells You

How To Read DMARC Reports

Most guides to reading a DMARC report show a screenshot of a dashboard, or three or four lines pulled from an XML file. Either one gets called a walkthrough. Search enough of them and a pattern shows up. They cover the same aggregate report, from the same angle, and stop the moment forensic reports come … Read more

What Is DMARC? How It Works, Its Policies & the Path to Full Enforcement

What Is DMARC

Most companies that publish a DMARC record never actually turn it on. They set up monitoring, collect the reports, and stop there, sometimes for years, sitting at zero real protection while believing the box is checked. Roughly three out of every four domains with a DMARC record are stuck in exactly this spot. Business email … Read more

The Email A/B Testing Guide: What to Test First, What Corrupts Your Results, and How to Build a Programme That Keeps Improving

Email A/B Testing

A/B testing in email marketing is the closest thing we have to a controlled experiment in a channel built on variables. You isolate one element, run it against a control, and let your audience’s behaviour tell you what works. In theory, every test advances your programme. In practice, most email A/B testing produces far less … Read more

The Email Personalization Guide: 4 Levels, What Each Requires & Why Bad Data Breaks All of Them

Email Personalization Guide

If you have read other email personalization guides before, you already know the standard advice: add the subscriber’s first name to the subject line, segment your list, use dynamic content, and watch your engagement improve. That advice is not wrong. It is just incomplete. What most guides skip is the part that determines whether any … Read more