Can't transfer character, help (SoD)

My character has no active auction,s no mail and has emptied his quest log and yet i keep getting the error that tell me to empty my mail box.

Can players block others from transfering by sending them a mail which takes 1 hr to arrive, blocking the players from transfering?

I have been waiting for 1 hr and i still didn’t get any mails or anything.
Can someone explain what s going on?