I am trying to connect my site's RSS feed to Mailchimp, but my feed doesn't pass basic RSS validation (http://testrtc.com/feed).
The reason for that is 3 empty lines at the beginning of the feed, which I am clueless as to where they came from.
I tried disabling all plugins but the result is the same. Assuming the culprit is my theme - where should I go search for it? My theme has no feed*.php files in it.