Sending foreign currency to others privately may involve the crime of illegal business operation, and how to measure the penalty depends on the specific circumstances of the crime.

According to Article 2 of the Interpretation of the Supreme People's Court and the Supreme People's Procuratorate on Several Issues Concerning the Application of Laws in Handling Criminal Cases of Illegal Payment and Settlement of Funds and Illegal Trading of Foreign Exchange, illegal foreign exchange transactions, such as buying and selling foreign exchange or buying and selling foreign exchange in disguise, are conducted in violation of state regulations, disrupting the order of the financial market.

If the circumstances are serious, he shall be convicted and punished for the crime of illegal business operation in accordance with the provisions of Item 4 of Article 225 of the Criminal Law.