Add initial Stripe Payment integration for invoices

functions.php

@@ -532,7 +532,8 @@ function sendSingleEmail($config_smtp_host, $config_smtp_username, $config_smtp_
 
     catch(Exception $e) {
         // If we couldn't send the message return the error, so we can log it
-        return "Message not sent. Mailer Error: {$mail->ErrorInfo}";
+        error_log("ITFlow - Failed to send email: " . $mail->ErrorInfo);
+        return substr("Mailer Error: $mail->ErrorInfo",0,150)."...";
     }
 }