iTunes U User Guide for web

Email a discussion author in iTunes U for web
As a course instructor, you can email the author of a discussion or reply in your private course.
Email a discussion or reply author
In iTunes U
for web, do one of the following:
Click Posts > Discussions to display all discussions in the current course.
Click Posts > Recent Posts (in-session courses), Posts > All (in-session courses), Posts > All Posts pane (self-paced courses), or Posts > topic to display discussions attached to a specific post in the current course.
Do one of the following, depending on your view:
Click a discussion.
Click the post with the
discussion you want, then click the discussion.
Click
for the discussion or reply whose author you want to email.
Choose Email Author.
iTunes U opens your default email client and displays a new email message using the addresses of author in the address field (if an email is associated with the account).