It’s been more or less a week I cannot receive in game mail. It seems the one I send reach players correctly, but the mail anyone sends me just disappear and never reach me. Friends and strangers lost a lot of items trying to send them to me (weapons, dyes, armors …), so it’s becoming quite annoying :/
Edit :
Okay, more precisions about the bug. Actually, my mail box was full … Except it wasn’t. I had 9/10 mail in it, and the game considered it full, so I didn’t receive the next mails. Now that I deleted the old ones, I received the new and reached correctly 10/10 mail and my mail box is red, telling me I need to do something.
TL;DR : my mail box contained 9/10 mails but behaved like it was full.