The recommended <itunes:email> element is missing

If an itunes:email element is not included, iTunes will send automated messages to the email associated with the iTunes Music Store account through which the podcast was submitted.

Consider including the itunes:owner element, along with a valid email address, immediately under the channel element.

An example follows:

<itunes:owner>
  <itunes:name>Your Name</itunes:name>
  <itunes:email>your-email@example.com</itunes:email>
</itunes:owner>