Duplicate Header List Unsubscribe - Error

[btmgreg]

Stacktrace error -

Code:

Code:

Server error log
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 17 February 2024 at 4:14 PM
Stack trace
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