Make all Apple Mail attachments an icon with terminal

For a long time now, we've been frustrated with Apple Mail's decision to show one-page attachments in their entirety (inline) when we're composing emails.  By default, Apple mail will only produce a thumbnail for the attachment if it's more than one page.  That gets very messy if we're sending several one-page attachments. One of our consultants, Pat O'Rourke, found a terminal command that will change the default behavior to produce an icon for every attachment. [...]