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Transaction failed: Duplicate header 'Auto-Submitted'

Thread starter bengineer
Start date May 7, 2025

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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...

N	Error Log Floodet with Email to XXX from failed: An email must have a "From" or a "Sender" header. noahblank Jan 4, 2025 Xenforo RSS Feed
A	best practices for integrating real-time property listings and transaction data using Java-based APIs in the real estate industry? adnanalikhan607 Oct 22, 2024 Xenforo RSS Feed
C	Which SMTP provider do you use to send transactional emails? Cromulent Sep 10, 2024 Xenforo RSS Feed
S	Payment profile and transaction details in getPurchasableFromExtraData stromb0li May 19, 2025 Xenforo RSS Feed
C	Transactional email list centomegabit Dec 18, 2024 Xenforo RSS Feed

Transaction failed: Duplicate header 'Auto-Submitted'

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