When my opponent is serving in squash, if I want to return the serve, can I volley this ball back to them? That is, without the ball hitting the floor (opponent serves > front wall > I volley the ball back).
If yes, do I have to stay within my own serving box? How many of my feet have to remain in the box, one or both?
If no, can I cross the T-line in front of my box if I keep one foot in it?
Yes, you can volley. A legal serve is defined in Rules of Squash. Defining where the ball must land is:
5.7.4 the ball, unless volleyed by the receiver, bounces for the first time in the opposite quarter-court without touching any line; and [...]
Volleying allows the serve to be legal without landing on the ground.
The service box and quarter-court lines are limits for the server and the serve, not the receiver. I don't see it explicitly mentioned in the rules, but the receiver should be able to stand anywhere that doesn't interfere with the service.
