title: Email sent using Contact Form 7 shows <a> tag code not a formatted link
body: <p>I am using Contact Form 7 plugin with this addon "Contact Form 7 Dynamic Text Extension" which allows you to use shortcodes to add data to your emails and form elements
  <a href="https://wordpress.org/plugins/contact-form-7-dynamic-text-extension/" rel="nofollow noreferrer">https://wordpress.org/plugins/contact-form-7-dynamic-text-extension/</a></p>
  
  <p>I created a shortcode that based on the current page adds a link to a PDF file in the Autoresponder email that is sent.</p>
  
  <pre><code>function get_pdf_link( $atts ) {
      global $post;
  
      switch ($post-&gt;post_title) {
          case 'Agency':
              return '&lt;a rel="nofollow" target="_blank" href="http://example.com/qcmresearch/wp-content/uploads/2018/04/Agency-Evaluation-Checklist.pdf"&gt;Download the Agency Evaluation Checklist&lt;/a&gt;';
              break;
          case 'Signup':
              return '&lt;a rel="nofollow" target="_blank" href="http://example.com/qcmresearch/wp-content/uploads/2018/04/signup.pdf"&gt;Download the Signup Options&lt;/a&gt;';
              break;
          default:
              return '&lt;a rel="nofollow" target="_blank" href="http://example.com/qcmresearch/wp-content/uploads/2018/04/Agency-Evaluation-Checklist.pdf"&gt;Download the Agency Evaluation Checklist&lt;/a&gt;';
              break;
      }
  }
  add_shortcode( 'CF7_EBOOK_DOWNLOADFILE', 'get_pdf_link' );
  </code></pre>
  
  <p>The value from the shortcode gets added to the autoresponder email correctly but the a tag is not formatted into html and displays as code:</p>
  
  <pre><code>&lt;a rel="nofollow" target="_blank" href="http://example.com/wp-content/uploads/2018/04/Agency-Evaluation-Checklist.pdf"&gt;Download the Agency Evaluation Checklist&lt;/a&gt;
  </code></pre>
  
  <p>It should be formatted like this
  <br>
  <strong>Download the Agency Evaluation Checklist</strong></p>
  
  <p>I manually added the same link to the message body in Wordpress and it looked fine so there is something with the shortcode or how I added my link that is breaking the formatting.</p>
  
  <p>Update:
  I inspected the <code>&lt;a&gt;</code> tag in developer tools @ Yahoo mail and it is wrapped in parenthesis not sure why though <code>"&lt;a ...&gt;Download the Agency Evaluation&lt;/a&gt;"</code></p>