GMass Deliverability Test

GMass Deliverability Test is a free email tester that helps newsletter operators check where their email campaigns land. It determines if your emails are delivered to the inbox, spam folder, or promotions tab before you send to your full list. This allows you to identify potential issues early.

To use it, you send your campaign from any email marketing service to a provided list of 16 specific addresses. The tool then shows you the deliverability results in real time, letting you see exactly where your test emails land.

This tool also functions as a spam checker, as some of the test accounts are configured with popular spam filters like Barracuda, Mimecast, and Sophos. This provides a comprehensive pre-send analysis of your email's deliverability. Newsletter creators can use this to adjust content or sending practices to improve inbox placement.