The following types of e-mail content may cause psychological stress to individuals without being detected (meaning that it is difficult to detect abnormalities by conventional e-mail filtering methods, but it may be discovered during in-depth investigation).： ###Threatening or suggestive threatening words 1. **Vague threats** -For example, “You'd better be careful. Some things haven't been good recently.” It doesn't specify the specific threatening behavior, but this kind of vague words can make the recipient feel uneasy and worried. I don't know what the potential danger is, so I can bear psychological pressure. -Another example is “Someone is paying attention to your every move, don't do what you shouldn't do”. This kind of implication may involve personal privacy being violated or facing unknown surveillance, which keeps the recipient in a state of tension at all times. 2. **Threats to personal reputation** -The sender said“ "If you don't do what I say, I will shake out your hidden secrets.” The recipient may have some privacy that he doesn't want to be disclosed, fearing that once these secrets are leaked, it will cause great damage to his reputation, which in turn will cause huge psychological pressure, constant speculation and worry.Whether the secret will really be exposed and the consequences after exposure. ### Disclose sensitive or private information with bad intentions 1. **Accidental privacy exposure** -For example, “I know what examination you went to the hospital for last month, don't think you can hide it." The recipient will be surprised that their privacy is known to others, worried about how the information is obtained, and what adverse effects may follow. This kind of fear of privacy being violated will bring psychology.pressure. -If the content of the email is “I know all the embarrassing things about you in college. If you don't want to be spread, just obey.” When it comes to some potentially embarrassing experiences in the past, the recipient will worry that the spread of this information will affect their current image and interpersonal relationships, making them feel stressed. 2. **Privacy mentions related to illegal or unethical behavior** -The email says, “I know you participated in the illegal operation of the company, don't do anything improper.” The recipient will worry that he may face legal risks or professional crises, feel anxious about his future, and his psychological pressure will increase sharply. -For example, “I have mastered all the unethical investment behaviors you secretly did. Don't try to avoid responsibility.” The recipient must not only face the moral condemnation in his heart, but also worry about economic losses or other adverse consequences, and bear a huge psychological burden. ### Create uncertain anxiety situations 1. **Implies unknown risks** -The content of the email is “The situation has changed rapidly recently. You may encounter some troubles. Please pay more attention to yourself.” It does not specify what the trouble is. The recipient will fall into worry about future uncertainty, constantly guessing about possible problems, and psychological pressure will continue to rise. -Like “There are some new situations that arise, which are related to you, but I can't say exactly what it is, you have to be mentally prepared”, this kind of ambiguous expression will make the recipient feel extremely uneasy and do not know what kind of predicament they are about to face. 2. **Use psychological fear factors** -For example, the sender mentioned that “there are viruses spreading everywhere now, and your information is likely to be infected. Think of a way." Taking advantage of people's fear of virus infection information leakage, etc., the recipient will worry about their important information such as identity information, financial information, etc. being stolen, resulting in a strongPsychological pressure, you may constantly check your accounts and equipment. -Another example is “a new type of fraud method has recently become popular, which is specifically aimed at people like you. Be careful not to get caught.” The recipient will be afraid that he will become the target of fraud and stay vigilant at all times, which will increase the psychological burden.