Evolution 3.22.6 on a debian 9 system. I switched from Ubuntu 18.04 to debian 9. Before the switch I was able to drag and drop e-mails to the attachment tab in tasks. With the new system I can still drag an e-mail and drop it to the attachments tab and it is shown there as an icon but when I try to open it I only get a dialog box "Import Data Berkeley Mailbox (mbox) with three options (see screenshot). The mail cannot be opened though. Which settings do I have to change in order to attach the mail as text or html automatically?
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