XenForo XF Software Upgrade Now Running Errors

[DaveM]

Since I upgraded my forum software in the last week I have been running the following errors

Code:

Swift_TransportException: Email to ********.sympatico.ca from *****@triumphtalk.com failed: Expected response code 250 but got code "554", with message "554 Transaction failed: Duplicate header 'Auto-Submitted'. " src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459
Generated by: Unknown account Feb 12, 2024 at 2:20 PM
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