How to Email a PDF Document. Portable Document Format files are secure and easy to read using free software, such as the industry-standard Adobe Reader program.

How to Open Email Attachments in Thunderbird. Thunderbird, a free, open-source desktop email client, lets users retrieve and read messages from a variety of email servers. One of Thunderbird's ...

The PDF will then open in the Adobe reader app for editing. Once the PDF document is opened from either dropbox or an email, the Adobe app can be used to its full potential.