I did tried in my focal VM with both xdg-utils and claws-mail and it worked here (see attached image). In claws it opened a gtk stuff, with settings steps and a window with the message to be composed and the attached file.
Maybe someone else in this bug/thread has any idea what is happening. As the security update was already reverted I don't see any ways it can be security related with the sec update. ** Attachment added: "image.png" https://bugs.launchpad.net/ubuntu/+source/xdg-utils/+bug/1909941/+attachment/5452350/+files/image.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1909941 Title: xdg-email changes break simple-scan email functionality To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xdg-utils/+bug/1909941/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs