no such recipient

I found this series of emails in Ella's inbox. She tried to email a thank you to one of her teachers, but it was returned. I amused by her response:

what ever

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Final-Recipient: rfc822; aicarodriguez@apsva.us
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host

aeschylus.groupwise.instruction.nds[158.59.252.67] said: 550 No such
recipient (in reply to RCPT TO command)

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---------- Forwarded message ----------
From: Isabella Moore <isabella.j.moore@gmail.com>
To: aicarodriguez@apsva.us
Date: Thu, 30 Dec 2010 15:24:00 -0500
Subject: Thank you

Thank you thank you thank you for being A part of first grade !