this topic might be linked to a issue where emails are not being sent out from the plugin.
reference https://wordpress.org/support/topic/email-delivery-4/
-im having this same issue, the plugin simply has stopped sending email for me all together. i dont know when exactly it stopped i believe it was in v 4.9.
-are their any fixes yet? i have not attempted a uninstall and reinstall. YET.
i am able to send a receive email via;
<?php
$to = 'nobody@example.com';
$subject = 'the subject';
$message = 'hello';
$headers = 'From: webmaster@example.com' . "\r\n" .
'Reply-To: webmaster@example.com' . "\r\n" .
'X-Mailer: PHP/' . phpversion();
mail($to, $subject, $message, $headers);
?>
