What is the ruling on sending money in one currency and having the recipient receive it in another currency?

Question:
He says: I am a resident in the Kingdom, and I transfer riyals with someone who is a resident here, and his brother delivers them to me, or his brother delivers them to my family. His brother delivers them to my family in Sudanese dinars. Is this permissible?

Answer:
By Allah, there is a problem with this, because this is a currency exchange. This is an exchange of Saudi riyals without Sudanese dinars, and there is no simultaneous exchange. The riyals are delivered in Saudi Arabia, and the dinars are delivered in Sudan. There is a problem with this because it falls under riba (usury or interest), specifically riba al-nasi'ah (usury of deferment). The Prophet (peace and blessings be upon him) said: “So that they do not separate while there is something between them.” If you find a means other than this method, it is safer for your conscience.