Eudora for Linux for Linux

Eudora for Linux is a mail and news application based on the open source Thunderbird client from Mozilla. Eudora is a branded version of Thunderbird with some extra features added by the Eudora developers, "Penelope" is an extension (also called an "add-on") that can be used with either Eudora or Thunderbird. The Eudora installer includes the corresponding version of Penelope along with it so there is no need to install Penelope if you are installing Eudora. Most features in Penelope can be accessed when used with Thunderbird, but there are a few that require Eudora in order to work correctly and it's not something that gets tested.