Answer:
To look at an example email of a sent or pending campaign, you may click on "options">"example" to the right of the line associated with your campaign in the overview of sent/pending campaigns or access the recipient's message history.
If your campaign includes an A/B test, the example will not be available via the “options” menu, but you can view it in the recipient’s message history.
If you've just pressed "send", you must wait until the campaign is generated before you can view it.
Under the "Pending" tab
In the recipient's message history