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SMTP 1 min read

Periodic Table of Deliverability Score

Brad Slavin
Brad Slavin General Manager
Updated May 26, 2025

Quick Answer

The Periodic Table of Email Deliverability is a visual reference that maps the elements affecting whether your messages reach the inbox: configuration issues, sending options, authentication, content, and reputation factors. It is a quick way to scan the common reasons messages get held up before arrival.

Email deliverability

Ever wanted to understand some of the elements that impact your deliverability, take a look at the Periodic Table of Email deliverability. It outlines the common issues, configurations and sending options that could be keeping your messages from making it to the inbox.

Brad Slavin
Brad Slavin

General Manager

General Manager at DuoCircle. Product strategy and commercial lead across the email security portfolio.

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