diff --git a/assets/js/src/common/set_from_address_modal.tsx b/assets/js/src/common/set_from_address_modal.tsx
index da659ffdf6..f3f53e77fd 100644
--- a/assets/js/src/common/set_from_address_modal.tsx
+++ b/assets/js/src/common/set_from_address_modal.tsx
@@ -4,6 +4,37 @@ import ReactStringReplace from 'react-string-replace';
 import jQuery from 'jquery';
 import MailPoet from 'mailpoet';
 
+const mailPoetApiVersion = (window as any).mailpoet_api_version as string;
+
+const handleSave = async (address: string|null) => MailPoet.Ajax.post({
+  api_version: mailPoetApiVersion,
+  endpoint: 'settings',
+  action: 'setAuthorizedFromAddress',
+  data: {
+    address,
+  },
+});
+
+const getErrorMessage = (error: any|null): string => {
+  if (!error) {
+    return MailPoet.I18n.t('setFromAddressEmailUnknownError');
+  }
+
+  if (error.error === 'unauthorized') {
+    return MailPoet.I18n.t('setFromAddressEmailNotAuthorized').replace(
+      /\[link\](.*?)\[\/link\]/g,
+      '<a href="https://account.mailpoet.com/authorization" target="_blank" rel="noopener noreferrer">$1</a>'
+    );
+  }
+
+  return error.message || MailPoet.I18n.t('setFromAddressEmailUnknownError');
+};
+
+const getSuccessMessage = (): string => MailPoet.I18n.t('setFromAddressEmailSuccess').replace(
+  /\[link\](.*?)\[\/link\]/g,
+  '<a href="?page=mailpoet-settings#basics" rel="noopener noreferrer">$1</a>'
+);
+
 const showSetFromAddressModal = async () => {
   MailPoet.Modal.popup({
     title: MailPoet.I18n.t('setFromAddressModalTitle'),
@@ -59,6 +90,20 @@ const showSetFromAddressModal = async () => {
         if (!address) {
           return;
         }
+        try {
+          await handleSave(address);
+          MailPoet.Modal.close();
+          MailPoet.Notice.success(getSuccessMessage());
+        } catch (e) {
+          const error = e.errors && e.errors[0] ? e.errors[0] : null;
+          const message = getErrorMessage(error);
+          addressValidator.addError('saveError', { message });
+        }
+      });
+
+      addressInput.addEventListener('input', () => {
+        addressValidator.removeError('saveError');
+      });
     },
   });
 };
diff --git a/views/layout.html b/views/layout.html
index 627fa264cd..07a8edc2fb 100644
--- a/views/layout.html
+++ b/views/layout.html
@@ -93,6 +93,9 @@ jQuery('.toplevel_page_mailpoet-newsletters.menu-top-last')
   'setFromAddressModalTitle': __('It’s time to set your default FROM address!', 'mailpoet'),
   'setFromAddressModalDescription': __('Set one of [link]your authorized email addresses[/link] as the default FROM email for your MailPoet emails.', 'mailpoet'),
   'setFromAddressModalSave': __('Save', 'mailpoet'),
+  'setFromAddressEmailSuccess': __('Excellent. Your authorized email was saved. You can change it in the [link]Basics tab of the MailPoet settings[/link].', 'mailpoet'),
+  'setFromAddressEmailNotAuthorized': __('Can’t use this email yet! [link]Please authorize it first[/link].', 'mailpoet'),
+  'setFromAddressEmailUnknownError': __('An error occured when saving FROM email address.', 'mailpoet'),
 }) %>
 <% block translations %><% endblock %>