Sender authentication
SPF, DKIM and DMARC calculated from a real received message and trusted SMTP metadata.
THE QUIET CHECK BEFORE SEND
Better newsletters start with a real test.
MailMarten is building technical newsletter QA for agencies. The first production release is open to invited testers while we validate authentication, spam analysis and direct Gmail and Outlook observations.
Enter the private test → Technical QA and inbox placement are not available yet.WHAT WE’RE VALIDATING
Explainable spam score
A reproducible SpamAssassin score with the rules that contributed to it.
Observed inbox location
Direct test copies sent from your ESP to personal Gmail and Outlook.com inboxes.
The inbox result will describe those test copies only. It will not predict where an entire campaign lands.