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Email conversation takeover is a post-compromise attack where an adversary who already controls a legitimate mailbox hijacks an active email thread and inserts fraudulent replies from a sender the recipient already trusts. Because the account is real and the thread is real, the messages pass SPF, DKIM, and DMARC and arrive looking exactly like the conversation they belong to. You detect it by analyzing how the account and the thread normally behave, not by scanning message content.
First seen on securityboulevard.com
Jump to article: securityboulevard.com/2026/08/email-conversation-takeover-how-to-detect-thread-hijacking-after-account-compromise/
