Category
Analyze SPF, DKIM, DMARC, headers, Received chains, and SMTP status codes.
BIMI Record Parser
Parse a BIMI DNS TXT record, break out the v, l, and a tags, and flag scheme, opt-out, and structural problems without fetching the logo or VMC.
DKIM Record Parser
Parse a DKIM public-key DNS TXT record or a DKIM-Signature header, break out every tag, and flag syntax and key-material problems without any DNS lookup or signature verification.
DMARC Record Parser
Parse and statically check one DMARC record using current RFC 9989 semantics, including test mode, PSD policy, report URIs, and historic tags. No DNS is resolved.
Email Header Viewer
Unfold a pasted email header block, decode RFC 2047 encoded-words, and list every field in order — entirely in your browser.
Message-ID Tool
Generate and validate RFC 5322 Message-ID header values.
Received Header Timeline
Turn the Received chain of a pasted message into an ordered hop timeline with per-hop delays — entirely in your browser.
SMTP Status Codes
Look up SMTP reply codes and enhanced status codes, and parse SMTP responses for inconsistencies.
SPF Record Parser
Parse and statically check one SPF (RFC 7208) TXT record: terms, qualifiers, the DNS-lookup count against the limit of 10, and common misconfigurations. No DNS is resolved.