Originally posted by [b]theultramage[/b]
http://www.eathena.ws/board/index.php?autocom=bugtracker&showbug=304
Currently, chars don't get sent into a 'mailing' state that would restrict them from doing normal actions (similar to how you can't do anything while having kafra storage open). The lack of state means it's impossible to know whether you have a mailbox open or not, therefore the server can't prevent you from
1. moving while having storage open
2. sending arbitrary mailbox manipulation request packets, even when mailbox wasn't opened
3. dropping an item while sending it as an attachment at the same time
Third lets you duplicate items any time. At the moment, there aren't any checks for whether the char actually has the item in his inventory.
After a small modification (adding checks, and a mail deletion request if they fail), this problem's solution becomes identical to that described in bugreport
#232.
Regarding the first two, we're lacking a "mail window closed packet" that would solve this. Problem is, it might not exist...