When previewing a comment, displays the visitor's e-mail address. Used to pre-fill the e-mail field in the comment form.

<p class="field"><label for="c_mail">{{tpl:lang Email address}}&nbsp;:</label>
<input name="c_mail" id="c_mail" type="text" size="30" maxlength="255" value="{{tpl:CommentPreviewEmail encode_html="1"}}" />
</p>