Author
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Field Description:
The email address of the author of the item. Typically, this field is only used if the author is different than the feed's Editor (Managing Editor).  
 
Including a name for the email address in this field is optional. The proper syntax for doing so would be: user@myemail.com (John Doe).  
 
Field Usage:
This is an optional field.  

Reference:
http://blogs.law.harvard.edu/tech/rss