The RSS specification requires the email address and the name of the
author to be provided in the <author> element in the format
"email@domain.com (Name)".

http://www.rssboard.org/rss-specification#ltauthorgtSubelementOfLtitemgt

Currently, only the author's name is provided. This is invalid
RSS. Please find attached a patch fixing this.

Regards,
Arun Isaac.