diff --git a/lib/Mailer/Methods/ErrorMappers/MailPoetMapper.php b/lib/Mailer/Methods/ErrorMappers/MailPoetMapper.php
index 16b31747ec..a19d7ed8a7 100644
--- a/lib/Mailer/Methods/ErrorMappers/MailPoetMapper.php
+++ b/lib/Mailer/Methods/ErrorMappers/MailPoetMapper.php
@@ -92,7 +92,7 @@ class MailPoetMapper {
   private function getUnauthorizedEmailMessage($sender, $newsletter) {
     $email = $sender ? $sender['from_email'] : null;
     $message = '<p>';
-    $message .= sprintf(WPFunctions::get()->__('The MailPoet Sending Service did not send your latest email because the address <i>%s</i> is not yet authorized.', 'mailpoet'), $email ?: WPFunctions::get()->__('Unknown address'));
+    $message .= sprintf(WPFunctions::get()->__('The MailPoet Sending Service did not send your latest email because the address %s is not yet authorized.', 'mailpoet'), $email ?: '<i>' . WPFunctions::get()->__('Unknown address') . '</i>' );
     $message .= '</p><p>';
     $message .= Helpers::replaceLinkTags(
       WPFunctions::get()->__('[link]Authorize your email in your account now.[/link]', 'mailpoet'),