Es gibt ja Leute, die lassen alle ihre E-Mails in der Inbox. Wer seine E-Mails hingegen in Ordner ablegt und mit Apples Mail.app arbeitet spart viel Lebenszeit mit dem bloß 8 € kostenden MsgFiler:
MsgFiler is a plug-in for Apple Mail which quickly files emails into existing mailbox folders. MsgFiler’s fast searching means you just have to type a few characters to find the right mailbox. Move selected messages with a click or open a mailbox without having to navigate the mailbox folder pane. MsgFiler is optimized for keyboard-only usage, perfect for Apple Mail power users.