Postbox is a mail client for Windows and Mac computers. In addition to the usual functions, the program offers the possibility of creating libraries containing e-mail attachments. You can search for files attached to your email, send them to your friends, or segregate them.

Postbox can import settings from Mozilla Thunderbird, supports Gmail, POP, IMAP, RSS, mailing lists, as well as social networks such as Facebook and Twitter. In addition to sending emails, you can also save notes and a list of tasks to complete. In addition, the program has antiphishing protection.