The Deliverability Lab

Lessons from the most extensive email deliverability study, ever.

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Is Bounce Rate Still A Good Deliverability Metric?

Is Bounce Rate Still A Good Deliverability Metric?

A lot of people still use “Bounce Rate” as a way to measure things like Data Provider Quality and Email Deliverability. But our two year long research study found that this metric is no longer as useful as it once was for measuring deliverability. In this article, we’ll take a closer look at why this […]

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Anatomy of A SPAM Filter (pt1) : What They Really Look For

Anatomy of A SPAM Filter (pt1) : What They Really Look For

Spam filters are black boxes for a reason — if everyone knew how they worked, they’d be much easier for bad actors to crack. This means that to understand how they work, we have to take a hands-on approach to testing and observing their behaviors, developing hypotheses on how they work and then testing those […]

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Why do SMTP Verifiers Get Different Results?

Why do SMTP Verifiers Get Different Results?

SMTP verification should be a commodity — the code is open source, it costs virtually nothing and it works over a standardized protocol. Yet cold email marketers always verify their lists with multiple email verification services, increasing their verification project several fold. At first this doesn’t make sense — like buying multiple thermometers to measure […]

How Does Catchall Verification Work?

How Does Catchall Verification Work?

Email verification was a commodity for the longest time — all products did the same thing and produced similar results. But recently, a dozen startups (Findymail, Prospeo, Scrubby, Leadmagic, etc) emerged claiming to do it “better” than legacy players. These companies have gotten a lot of attention, due to their claim that they can verify […]

How Does SMTP Verification Work?

How Does SMTP Verification Work?

SMTP verification is the oldest and most standard way of verifying emails. In this article, we’re going to cover everything you need to know about SMTP verification — how it works, where it fails and how to get better results. Let’s go! What is SMTP? SMTP stands for Standard Mail Transfer Protocol. Just like other […]

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How To Measure Email Deliverability (Pt1)

How To Measure Email Deliverability (Pt1)

Email deliverability is critical to cold email. Without it, you’re spending thousands of dollars sending email into a black hole where your prospects will never see them. BUT, email deliverability comes with a dark side – nobody REALLY knows how to measure it (yes, even those “email experts”). This is a big problem for email […]

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