A retry mechanism typically involves the following steps:
Detection of a delivery failure: The email server identifies that the email was not successfully delivered due to a transient error. Queueing the email for retry: The failed email is placed in a queue to be retried at a later time. Retry attempts: The system makes multiple attempts to resend the email at predefined intervals. Final status determination: If the email is successfully delivered during one of the retry attempts, it is marked as delivered. If all retry attempts fail, the email is marked as undeliverable.