(pun intended)

1. have a "detach all" button that just dumps everything from the first x messages w/ attachments into your inventory where x = number of available inventory slots
2. automatically (or make it a UI option) delete messages where you detached the attached item
3. allow mailing multiple items per message (10-20 would be great), make each attached item count as a message if you want to keep the total number of mailed items the same as now
4. in addition to the lock/unlock and trash buttons in your inventory add a "mailto" button, next time you go to the mailbox you add a recipient and click the mailto button and the next mailto selected item in your inventory is mailed to that person without any additional clicks
5. allow a "default recipient" configuration, all of my toons mail everything to my crafter, I have to type his name into EVERY SINGLE MESSAGE, please save my keyboard and my poor fighter joints the wear and tear