Of course you can transfer coins into any valid wallet address, but the real question is - Can the owner of that address access the coins, and can he use them?
People only can access bitcoins if they have Bitcoin private keys but if you ask the receiver about his receiving address for a coming transaction from you, you can not know whether he has its private key or not. You can ask him but basically it is not your business. He must be responsible of what he does in bitcoin storage and you only need to send your bitcoin to that address and fullfil your responsibility in the trade.
Reminder: do not keep your money in online accounts. It is a reminder about risk of non control and non access to your bitcoins if you store them in a centralized exchange or online platform.