Both the partner of the recipient and the recipient themselves are indeed permitted to stand outside the court during gameplay.
The rules do not specify where players should position themselves, allowing for flexibility in strategy and gameplay. For instance, if a player believes the optimal position to receive the ball is outside the court, they are within their right to stand there. However, while this scenario may seem unconventional, it serves as an illustrative example of the freedom players have in choosing their positions during a match.