Remove SPF notice

[MAILPOET-2867]

assets/js/src/newsletter_editor/components/sidebar.js

@@ -7,7 +7,6 @@ import Marionette from 'backbone.marionette';
 import SuperModel from 'backbone.supermodel';
 import _ from 'underscore';
 import jQuery from 'jquery';
-import checkSPFRecord from 'common/check_spf_record.jsx';
 
 var Module = {};
 var SidebarView;
@@ -348,9 +347,6 @@ Module.SidebarPreviewView = Marionette.View.extend({
           'MailPoet Free version': window.mailpoet_version,
           'Domain name': data.subscriber.substring(data.subscriber.indexOf('@') + 1),
         });
-        if (App.getConfig().get('validation.validateSPFRecord')) {
-          checkSPFRecord();
-        }
       }).fail(function (response) {
         if (response.errors.length > 0) {
           MailPoet.Notice.error(