How to Export Email (or any Printable Document) as a PDF File on an iPhone or iPad

If you would like to export an email or any document from an app on your iOS (iPhone/iPad/iPod touch) device as a PDF file, you can do it using functionality built-in to the device, but the procedure is not obvious.

Here's how to do it:

http://usefulbulk.com/iospdfexport/