Happens to me too on LXDE Ubuntu 14.04, same behavior, same bug. I have tried with Gnome Shell 3.12.2 and all works fine.
I've open some thread about this: One on LXDE Forum without any answer: https://forum.lxde.org/viewtopic.php?f=8&t=37184 Another one on Linuxquestions: http://www.linuxquestions.org/questions/linux-desktop-74/lxde-and-simple-scan-sending-email-from-4175591298/ Thanks -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xdg-utils in Ubuntu. https://bugs.launchpad.net/bugs/1540399 Title: Simple Scan does not attach files in Thunderbird Status in One Hundred Papercuts: Confirmed Status in xdg-utils package in Ubuntu: Confirmed Bug description: Steps to reproduce: 1- Set Thunderbird as default email client 2- Open Simple Scan and scan a document 3- Choose Document -> E-mail 3- Document does not get attached in Thunderbird This happens in Trusty and later. To manage notifications about this bug go to: https://bugs.launchpad.net/hundredpapercuts/+bug/1540399/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : firstname.lastname@example.org Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp