Whenever there are inline images in the body of an email, there seems to be no way to zoom into the full size of that image. The workaround today is to right-click on the image, "Save Image", and view the file on the computer.
For reference, see how Gmail allows clicking into an inline image to zoom into the full size view of that image (or at least a view that fills the browser window).
Nylas Mail 1.5.0
macOS Sierra 10.12.3 (16D32)
No third-party plugins installed
Google Apps account
Whenever there are inline images in the body of an email, there seems to be no way to zoom into the full size of that image. The workaround today is to right-click on the image, "Save Image", and view the file on the computer.
For reference, see how Gmail allows clicking into an inline image to zoom into the full size view of that image (or at least a view that fills the browser window).
Nylas Mail 1.5.0 macOS Sierra 10.12.3 (16D32) No third-party plugins installed Google Apps account