Is it possible to add an email as a tasks as an attachment as well as a link? :-! This way you would be able to open it when you go to the web interface.
At this time, the Outlook Plugin adds a link to the Email, and its required to be opened in Outlook. There are no ways to change this. If you'd like to refer to an email and add an attachment as well we do have "emailing to project" support. https://todoist.com/blog/2013/01/zero-inbox-policy-with-todoist/
Though yes, we hope we can improve how this works and allow opening from anywhere.