Why do our mail servers assist scammers or is there a way to fool the server?

----- Original Message -----

From: Carlos

To: funkyhairbah@itccommunications.net

Sent: Sunday, August 22, 2010 7:39 PM

Subject: Fw: Mis fotos

Hola, te envío fotos nuevas (2-3 de ellos son demasiado franca, pero tú sabes que yo no soy tímido ;-)). Captura: fotos

veas la prueba - 

 

see the proof when we use this email address which is not registered with our mail server it is correctly refused, but the mail server lets the scammer´s mail with the incorrect address through

I have raised this with our server so let us see what their reply is?

 

The original message was received at Sun, 22 Aug 2010 18:26:00 +0200
from 8.red-81-47-8.staticip.rima-tde.net [81.47.8.8]

   ----- The following addresses had permanent fatal errors -----
<funkyhairbah@itccommunications.net>
    (reason: 550 5.1.1 <funkyhairbah@itccommunications.net>... User unknown)

   ----- Transcript of session follows -----
... while talking to mailer.ran.es.:
>>> DATA
<<< 550 5.1.1 <funkyhairbah@itccommunications.net>... User unknown
550 5.1.1 <funkyhairbah@itccommunications.net>... User unknown
<<< 503 5.0.0 Need RCPT (recipient)