What languages are supported?
JungleMail languages depend on
Currently, JungleMail for SharePoint 2013/2016 comes with 6 language packs: English, German, French, Finnish, Portuguese and Brazilian Portuguese.
JungleMail for SharePoint 2010 comes with 5 language packs: English, French, Dutch, German and Finnish.
If you use any other language pack for SharePoint, JungleMail will automatically be set to English.