Had another in game mail crash with another char than before.
Think it was from unsold items again.
Error code 7F5B1EBD-764F-4F72-A712-9B84702225C8
Got crash again from clicking on Obsidium Cleaver in the mail
Error code
588C162A-F33A-4B40-938A-0B330C7A21D9
Noticed another thing when it crashed.
The char lost the actionbar settings every time it happened.
managed to clear the mail by opening all, instead of shift clicking mail by mail.