If you would like to print out a copy of mail in your InBox, click on the desired mail item(s) and choose “Print...” from the Snap menu. To toggle a single item between selected and unselected, hold the “Shift” key down as you click on it. If you would like to save the selected file to disk as a text file, choose “Save As...” from the Snap menu. The “Save As...” window also has an “Append” button that allows you to append the text of selected messages to an already existing text document (such as one that already contains saved messages).
