I like saving/exporting important project-related emails to my file server as .rtf documents. Apple Mail allows this. I am used to saving and archiving client correspondence to my server without having to rely on an email client to reopen it later (sometimes years later). I miss the ability to do this in Airmail. I have to hit "print" then save as a PDF as a workaround...but it is more cumbersome. (Also, the margins are really tight when I print. Print layout features such as margin control or the ability to scale a page down by a percentage would be nice.)