Hi, @fixit7!
This issue is similar to the one you have faced before.
You are using thunar
(the Xfce file manager) in MATE desktop environment, and you have some pieces of the Xfce environment missing. To configure preferred applications for thunar
, you need the following file:
$HOME/.config/xfce4/helpers.rc
This config file is used by the exo-open
mechanism and supports at least 4 application types:
WebBrowser - The preferred Web Browser.
MailReader - The preferred Mail Reader.
FileManager - The preferred File Manager.
TerminalEmulator - The preferred Terminal Emulator.
So, create the helper file and add the following line:
MailReader=thunderbird
I understand that habits are habits, but using caja
as your default file manager in MATE will protect you from these configuration problems and probably other implicit issues.