MailHeaderAnalyzer

Analyzes email headers offline: delivery chain with delays and TLS, SPF/DKIM/DMARC/ARC results and whether they really come from the receiving server, DMARC alignment, Exchange Online hybrid classification (AuthAs, AuthMechanism, CrossTenant), Microsoft Defender/EOP verdicts (SCL, BCL, CAT), SpamAssassin, Rspamd and anomalies such as duplicate From... More info