About sender.report
sender.report is a self-hosted tool that analyses your email deliverability — no account, no tracking, no third parties.
Instant Analysis
Results seconds after the mail arrives
No Account Needed
No account, no email address required
Self-Destructing
Mailboxes expire automatically
Open Source
Self-hosted & fully transparent
Mail Simulator – Test Changes Live
Paste your RFC 2822 email source into the editor and see immediately how changes to headers, HTML or subject affect the score. Content checks run live (600 ms debounce), DNS checks available on demand with one click.
Open Simulator →