Email Header Analyzer
tst.dev/email/headersPaste a message's raw headers to see its SPF, DKIM, and DMARC verdicts, the hop-by-hop delivery path, and any flags worth investigating.
Headers contain IP addresses — they never leave your browser.
Paste a message’s raw headers to see its SPF, DKIM, and DMARC results, the delivery path with per-hop delays, and a plain-English summary of anything worth flagging.