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These Duplicate header errors started popping up sometimes after upgrading to xenForo 2.2.14:
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Code:
Code:
Swift_TransportException: Email to [email protected] from [email protected] failed: Expected response code 250 but got code "554", with message "554 Transaction failed: Duplicate header 'List-Unsubscribe'. " src/vendor/swiftmailer/swiftmailer/lib/classes/Swift/Transport/AbstractSmtpTransport.php:459
Generated by: Unknown account Jan 31, 2024 at 1:29 AM
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