What sets sender.report apart
- Use is anonymous and free. A temporary mailbox is created automatically.
- 68 checks in five areas: authentication, DNS and infrastructure, spam filters, format and content, and headers and raw data.
- SPF, DKIM and DMARC are verified against your actual test mail. Findings name the cause and the next step.
- Reports are end-to-end encrypted. Only your link carries the key.
- After a DNS change, one click queries everything again and recalculates the score, without a new test mail.
- The mail simulator scores edited source immediately.
- The project is open source and runs as a Docker image on your own infrastructure.
How to test
- Open the start page and copy the test address it shows.
- Send a message from the system whose deliverability you want to check to that address.
- Open the report and go through the findings in order.