Send with review

- updated MailPoet logo
- added SPF
- hide Dkim for beta
- added warning in case the number of emails/sec is too high

assets/js/src/settings/tabs.js

@@ -34,13 +34,16 @@ define(
           // show sending methods
           jQuery('.mailpoet_sending_methods').fadeIn();
         } else {
-          // hide DKIM option when using MailPoet's API
-          jQuery('#mailpoet_mta_dkim')[
+          // toggle SPF/DKIM (hidden if the sending method is MailPoet)
+          jQuery('#mailpoet_mta_spf')[
             (group === 'mailpoet')
             ? 'hide'
             : 'show'
           ]();
 
+          // (HIDDEN FOR BETA)
+          jQuery('#mailpoet_mta_dkim').hide();
+
           // hide sending methods
           jQuery('.mailpoet_sending_methods').hide();