[RSS Feed/News] Emails can get stuck in the queue indefinitely

[XenForo]

Currently, email queue processing works roughly like this:

1. Mark entry as being processed by setting send_date 15 minutes into the future.
   1. If marking failed, it's already being processed; skip this item.
2. Deserialize mail_data.
   1. If deserialization failed or is not an instance of Swift_Mime_SimpleMessage, skip this item without further changes.
3. Attempt to send the email.
   1. If send failed, Mailer is expected to call the queue's...

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