On a smaller laptop screen, the new send via email screen does not have a scroll bar and you cannot move the panel such that you cannot access the buttons including "Send" option. This is high priority as it is stopping us sending invoices.
In this case, you may need to zoom out your screen in Reckon One.
You can typically do so in most web browsers by pressing "Control" and "-" keys at the same time, or manage the "Zoom" option in your web browser's settings. This should rescale the GUI in Reckon One and cause the button to appear again.