Developer(s)Postbox, Inc.[1]
Initial releaseSeptember 9, 2008; 15 years ago (2008-09-09)[2]
Stable release
7.0 / September 10, 2019; 4 years ago (2019-09-10)
Operating systemWindows, macOS[1]
Available in10 languages
List of languages
US English, with community translations into German, French, Spanish (Spain), English (British), Italian, Dutch, Portuguese (Brazilian), Russian, and Swedish
TypeEmail client, news client, feed reader

Postbox is a desktop email client, news client and feed reader for Windows and macOS. Written and sold by Postbox, Inc., it was launched at the TechCrunch 50 conference in 2008.[3]

Postbox was founded and staffed by several former developers from Mozilla. The software was built using Mozilla's Gecko browser engine, and was initially based on Thunderbird, Mozilla's own e-mail software.[4]

Postbox 7 requires 8GB of RAM, 200 MB of hard drive space, plus Windows 8 (or later) or macOS 10.13 (or later). The Windows version runs in 32-bit-mode on 32-bit and 64-bit systems.[5]


  1. ^ a b "Official website". Retrieved 18 December 2015.
  2. ^ "TechCrunch". 10 September 2008. Retrieved 18 December 2015.
  3. ^ "Mozilla-based Postbox promises faster, more connected email". Archived from the original on 10 October 2013. Retrieved 2015-12-18.((cite web)): CS1 maint: bot: original URL status unknown (link)
  4. ^ "Computer World". 9 February 2009. Retrieved 19 December 2015.
  5. ^ "System Requirements - Postbox". Postbox. Retrieved 2017-12-20.