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Transaction failed: Duplicate header 'Auto-Submitted'

Thread starter bengineer
Start date May 7, 2025

bengineer

Guest

May 7, 2025

I upgraded our forum 2 days ago to 2.2.15. Since then I have thousands of these errors:

Code:

Code:

Swift_TransportException: Email to xxx@aol.com from info@xxx.net 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 17 Feb 2024 at 7:21 PM Stack trace #0...

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