How to use this guide?
Arthur avatar
Written by Arthur
Updated over a week ago

In this guide, we provide you with detailed information on how to improve your deliverability.

If you want to learn what is SPF, SpamAssassin or how Domain Age can impact your email deliverability, you are at the good place.

We will also cover some actionable tutorials that will help you to stay away from spam folders.

Before you start, we recommend that you run a "Warmbox Email Spam Test", to have a better idea of the state of your email deliverability at the moment.

Here are the different items you will find inside your Warmbox report, and the corresponding sections of this deliverability guide:

Domain Blacklist

IP Blacklist

SpamAssassin Score




Reverse DNS

Domain age

List-Unsubscribe Header

Broken Links

Short URLs

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