Reporting-MTA: dns; Ubuntu-1204-precise-64-minimal.localdomain
X-Postfix-Queue-ID: D745015402F2
X-Postfix-Sender: rfc822; xxxxxxxxxxxxxxxxxxxxxxxxx@xxxxxxxx.xxx.xxx.xx
Arrival-Date: Thu, 15 May 2014 19:39:06 +0000 (UTC)

Final-Recipient: rfc822; xxxxx@xxxxxxxxxx.xxxxxx.xx
Action: failed
Status: 5.1.1
Remote-MTA: dns; av2.tnz.myschools.net
Diagnostic-Code: smtp; 550 5.1.1 <xxxxx@xxxxxxxxxx.xxxxxx.xx>: Recipient
    address rejected: undeliverable address: host
    adm4.tnz.myschools.net[125.236.44.24] said: 550
    xxxxx@xxxxxxxxxx.xxxxxx.xx... Unknown User (in reply to RCPT TO command)