How can I see both the plain text and the html versions of email?

Question

I've developing the part of a Ruby on Rails app that send out emails.

I've created two docs for the two different output formats - plain text and html.

How can I adjust my email client (e.g. gmail) to show each of the formats - both, one after the other, or just one but specify which.

Answer 1

In gmail you can do this by clicking on the little arrow next to the reply button. In the menu that the arrow opens, click "Show Original". Source