CiviMail/Cron Fails using BeeFree template
I think this might be related to the CSS brackets {} in the &lt;style&gt;&lt;/style&gt; tag a the top of your email source code, and/or Smarty enabled in CiviMail.

Removing entirely the style tag should fix the issue.

I think BeeFree already does inline styling, so it should not affect the formatting of the email.