Private browser-based analysis
Bounce Message Decoder
Paste the rejection text or non-delivery report. The analysis runs in your browser, so the pasted error is not uploaded to our server or sent to AI.
Works best with exact rejection codes such as Gmail 550 5.7.26, Outlook 550 5.7.515, SPF PermError, DKIM fail or DMARC fail.
Your email data stays in your browser. Pasted bounce content is not uploaded, stored or sent to an AI provider.
What this currently detects
- Gmail 550 5.7.26 unauthenticated sender errors
- Outlook / Microsoft 550 5.7.515 sender authentication errors
- SPF PermError and SPF DNS lookup limit failures
- DMARC failures where SPF passed but alignment failed
- DKIM signature failures
- Reverse DNS / PTR style mail server issues