The penalties for illegally detaining express mail are as follows:
1. The postal administration department shall order it to make corrections, confiscate its illegal income, and impose a fine of not less than 50,000 yuan but not more than 6,543,800 yuan;
2. If the circumstances are serious, a fine of 6.5438+10,000 yuan but not more than 200,000 yuan shall be imposed, and it may be ordered to suspend business for rectification until its express business license is revoked.
Legal basis:
Article 266 of the Criminal Law of People's Republic of China (PRC) stipulates that whoever defrauds public or private property in a relatively large amount shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention or public surveillance, and shall also or only be fined; If the amount is huge or there are other serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years and shall also be fined; If the amount is especially huge or there are other especially serious circumstances, he shall be sentenced to fixed-term imprisonment of not less than 10 years or life imprisonment, and shall also be fined or confiscated. Where there are other provisions in this Law, such provisions shall prevail.