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each time i tried to send a test email from the WP Mail SMTP plugin, I could following error in the browser:
504 ERROR
The request could not be satisfied.
CloudFront attempted to establish a connection with the origin, but either the attempt failed or the origin closed the connection.
If you received this error while trying to use an app or access a website, please contact the provider or website owner for assistance.
If you provide content to customers through CloudFront, you can find steps to troubleshoot and help prevent this error by following steps in the CloudFront documentation (https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/http-504-gateway-timeout.html).
Generated by cloudfront (CloudFront)
Request ID: sjKHNib-ZUYqYQpvJXDiOP0M8eA6xQghX2slrqXg1ghXdixPaWJLLw==
how can I solve that and why this error displayed??