Undelivered email is not being re-sent

My email configuration was using the wrong IP, so attempts to send email were getting “connection refused”. That should result in the email being stored in Youtrack and sent again when the email server is back up. Now that the email configuration is corrected, I do not see those email messages being re-transmitted. New email messages are being transmitted correctly. How can I tell whether the older email messages are gone, or just being delayed for some reason? How can I trigger Youtrack to re-send them?