[Fiware-lab-help] Returned mail: see transcript for details

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The original message was received at Fri, 25 May 2018 07:54:12 -0300
from [196.109.212.167]

   ----- The following addresses had permanent fatal errors -----
<andre at guaina.com.br>
    (reason: 550 5.1.1 <andre at guaina.com.br>... User unknown)

   ----- Transcript of session follows -----
... while talking to [201.16.160.129]:
>>> DATA
<<< 550 5.1.1 <andre at guaina.com.br>... User unknown
550 5.1.1 <andre at guaina.com.br>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)
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