ui: add email request ip

packages/ui-default/templates/layout/mail.html

@@ -24,6 +24,7 @@ body, .hydro { margin:0;color:#333;font-size:14px;font-family:"Tahoma","Segoe UI
 </div>
 <div class="hydro-footer">
 <p>{{ _('This email was sent by {0} automatically, and please do not reply directly.').format('<a href="' + url_prefix + '/" target="_blank">' + model.system.get('server.name') + '</a>')|safe }}</p>
+<p>{{ _('This email was requested from {0}').format(handler.request.ip) }}
 </div>
 </div>
 </div>