Adobe ACROBAT READER 7.0 Manual page 92

Using email in a review
To participate in reviews, you must have an email application and mail server connection.
Adobe Reader works with most email applications. Although you can't initiate reviews in
Adobe Reader, you can send an email message from Adobe Reader with an Adobe PDF
document as an attachment.
If more than one email application is installed on your system, Adobe Reader may try to
start the application you don't normally use when sending a PDF document as an
attachment. If this occurs, do one of the following:
(Windows) Double-click Internet Options in the Windows Control Panel. In the Internet
Properties dialog box, select the Programs tab, and then select your email application of
choice.
(Windows) Change the MAPI settings in your email application. In Windows, Adobe
Reader uses the Messaging Application Program Interface (MAPI) to communicate with
your email application. Most email applications come with MAPI settings to handle this
communication. For more information on configuring your email applications, see the
email application's online Help.
(Mac OS) In Mail (the email application that's included with Mac OS), choose File >
Preferences, select General, and then choose the email application you want to use from
the Default Email Reader pop-up menu. Restart Adobe Reader for the changes to take
effect. If your application is not listed, choose Select from the menu, and browse to the
location. (Be aware that if you select an application that is not listed in the Default Email
Reader menu, Adobe Reader may not support your application.)
Contact the person who administers your email account for help.
Once you've verified that Adobe Reader works with your email application, you can send
your comments as a PDF attachment.