The 'Recruitee Infrastructure Abuse' detection rule is designed to identify potentially fraudulent inbound messages originating from Recruitee domains, particularly 'recruitee.com'. The rule focuses on messages that discuss recruitment topics and include application links sent by unfamiliar or newly established email addresses. Indicators of concern include the presence of URLs that direct users to recently registered domains (less than 30 days old) or messages that contain only one link with text suggesting an application submission (e.g., 'apply', 'submit'). The rule employs multiple analytical techniques, including Natural Language Understanding (NLU) to ascertain the context of messages, along with sender and URL analysis to verify the legitimacy and history of the domains involved. An important enforcement mechanism of this rule is the emphasis on identifying new or outlier profiles that have exhibited no prior false positives, which serves to reduce the likelihood of legitimate messages being incorrectly flagged as threats. Overall, the rule helps fortify defenses against Business Email Compromise (BEC) and credential phishing attempts by scrutinizing the content and sender profile of incoming communications.