Returned mail: see transcript for details

The original message was received at Mon, 7 May 2007 11:44:56 +0700 (ICT)
from hydra.is.inet.co.th [203.150.217.131]

----- The following addresses had permanent fatal errors -----
<planetnn%inet.co.th@mc1.inet.co.th>
(reason: 550 5.1.1 <planetnn@mozart.inet.co.th>... User unknown)

----- Transcript of session follows -----
... while talking to mozart.inet.co.th.:
>>> DATA
<<< 550 5.1.1 <planetnn@mozart.inet.co.th>... User unknown
550 5.1.1 <planetnn%inet.co.th@mc1.inet.co.th>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)