Adobe ACROBAT READER 7.0 Manual page 130

Rejecting and returning a PDF document
If commenting is enabled in a PDF document that doesn't meet your requirements for
approval, you can reject the PDF document. Use the options in the Document Message
Bar to reject the document and return it to the initiator. When a PDF document is rejected,
the approval workflow must be reinitiated.
To reject a PDF document:
1. Open the PDF attachment in the email invitation.
2. In the Document Message Bar, click the Reject And Send button.
3. In the email message that appears, type the email address of the initiator or other
appropriate person in the To box. You can include the reason for rejecting the PDF
document by typing text in the body of the email message, which contains the message
that the document was not approved.
4. Click Send.