This is a continued version of Jibbs MailGet. All creds to you, Jibbs!
MailGet will let you retrieve all of your mail at the click of a single button.
You can click either the "Take All" Button on individual messages, or on your entire mailbox.
Blank messages with only items attach remove immediately. Messages with text will have their items removed, but text remain. Messages with money in them will automatically be picked up. Auction house winnings will be retrieved. Auction house listings that do not sell will be retrieved.