How can I include a list of what a user ordered (the line items) in an e-mail sent by Drupal Commerce? I want to send an e-mail that contains the content of a user's Drupal Commerce order (the line items) with Rules.

I tried modifying the default Send an order notification e-mail (in Rules) provided by Commerce.  I noticed that there was a [commerce-order:commerce_line_items] token, but when I insert this into an e-mail, I get a message of No line items found when the e-mail is sent, even though the order has line items.  What am I doing wrong?
The [commerce-order:commerce_line_items] token does not work when Completing the checkout process, which is the event for which the Send an order notification e-mail rule is triggered.

Instead, one way to do this is to use the Commerce E-mail module, which provides a [commerce-order:commerce-email-order-items] token and a new interface for editing the e-mail.  Note that you will need to disable the e-mail-sending rule when using this module (or else you will get duplicate e-mails, as the module help points out).