Inbox is a powerful multi function tool for managing your POP3 email before it reaches your email client application. It can fetch your email from multiple email accounts, collate mail from several accounts into a single account, perform point and shoot filtering directly on the mail server as well as on collected mail, filter your various email accounts before your normal email program connects, act as a proxy fetching mail only when your normal email program requires it or act as a filter proxy filtering your email accounts before your email client collects mail. There are tools to peek at mail directly on the mail server and in your Outlook message store, auto respond to email while you're away, redirect mail to one or more addresses, attach many accounts to a single email address, set up a simple mailing list.