XF 2.1 Email to members failed


Well-known member
I just tried to do a newsletter to our member base and it looks that all or most failed with this error. Is this a Xenforo error or my email server?

  • Swift_TransportException: Email to ### failed: Expected response code 250 but got code "421", with message "421 too many messages in this connection "
  • src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:383