You will need to check the email error logs on the server, if this is a dedicated server, then you can check the log file, typically in /var/log/maillog
If this is a vhost server, you will need to ask your host to tell you why those two emails failed to go out, have the host post the full failure message from the log and then post it here if hte host dont tell you how to solve the problem.
Also, we cant do much to help you, as you didnt post a domain for us to check.
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