Why it is important to run spam tests using the same sending setup as the one being warmed.

From a sending setup to another, the result of a spam test (and your deliverability) can be TOTALLY different.

Deliverability is mostly influenced by 3 factors :

The sending reputation of your mailbox, domain and IPs.
The content of your emails (wording, links, images, etc)
How your emails are sent (the provider : Gmail, Office, SendGrid, Custom SMTP, etc)

The sending setup / provider has a strong influence on your deliverability. (by the way, Google Workspace is the provider with the highest deliverability, Office365 is second).

Let's say you have a mailbox being warmed on MailReach and it's connected as a Google mailbox. That means MailReach warms the Google mailbox, the associated domain, and the associated IPs (Google IPs keep changing so it's not important, these IPs have the highest deliverability).

Given that context, if you run a spam test from the same email address but not sending directly from the Google inbox but from a third party tool, then it can BIAS your result. as it will be sent from a non Google IP and from a non Google Provider.

This is why we recommend to warm the sending setup you're going to use to send your campaigns. And then run your spam test with that setup.

This explains why you may have really different results between the warmer and the spam tests.

As the sending setup being warmed is different than the sending setup used to send the test email, then you can have very surprising scores.

If you have a high sender score but have poor results using the spam tests, it means the setup used to run the tests is spammy in some way, and you need to make changes.

We have a dedicated guide to help you solve this case :

Why I am still landing in spam while I have a high sender score on MailReach and how to fix it?

Updated on: 28/12/2022

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