XF 2.2 mails response code 250 but got code "451"


Well-known member
  • Swift_TransportException: Email to @.*** failed: Expected response code 250 but got code "451", with message "451-Requested action aborted 451 Mails per session limit exceeded. "
  • src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:457

Since some days this seems to happen very often every day. May someone tell me, what this means, please?
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