I can only get 10 mails at a time and before I was able to get more. I need more spaces.
Anet can you let us get 15 or 20 mails at a time please? It only allows space for 10 and I need more spaces please please. Before you could have more than 10 spaces for mail. 
Mail bug?
its always been 10 – since the start . Id assume the easy fix would be to ditch read messages
Yeah, the limit for player-sent messages has always been 10. There’s also a limit for non-player messages (15, I believe).