Fraudulent email judgment device, fraudulent email judgment method and fraudulent email judgment program

摘要

The fraudulent mail determination device (10) includes a consistency analysis unit (24). The consistency analysis unit (24) uses the newly received received mail as the target mail, and extracts the function words that indicate the reason for sending the target mail from the body of the target mail, thereby extracting the intention of the target mail. To identify. The consistency analysis unit (24) determines whether or not the target email is an invalid email based on the relationship between other received emails received in the past from the same sender as the target email and the intention of the identified target email. judge.