Check a message: SPF, DKIM, DMARC

Upload an .eml and see whether it passes DMARC, and if it does not, exactly which of the three failed and why.

The file never leaves your browser. Only DNS lookups go out, and they carry domain names — the selector, the From domain — never the message.

Choose an .eml fileAnalysed in your browser. The file is not uploaded.Sender IP

SPF is evaluated against the IP that delivered the message, not against anything inside it. It is read from the oldest Received header; if the .eml has none — exported from Sent, say — SPF cannot say anything until you put it here.