In version 19.0b2 inline images are shown in the body of the mail. BUT: Attached images are not displayed (previewed) directly in received emails; they must first be downloaded and then opened with a viewer. So it remains significantly more limited c...
Unfortunately, even in version 19.0b2, the text style (rich formatting) cannot be changed (even though HTML formatting is enabled when composing), and inline images are also not possible when composing. So it remains significantly more limited compar...