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Is it illegal for intermediaries to send dangerous text messages?

It is illegal for an intermediary to send dangerous text messages. Anyone who writes threatening letters or threatens the personal safety of others by other means according to Article 42 of the Law on Public Security Administration Punishment shall be detained for not more than five days or fined not more than 500 yuan. If the circumstances are serious, they shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan.