Subject: Returned mail: see transcript for details

From: Mail Delivery Subsystem <[email-masked]>
Date: Wed, 27 Aug 2008 05:52:27 +0700 (NOVST)

The original message was received at Wed, 27 Aug 2008 05:47:24 +0700 (NOVST)
from 189-79-89-167.dsl.telesp.net.br [189.79.89.167] (may be forged)

   ----- The following addresses had permanent fatal errors -----
<[email-masked]>
    (reason: 550-5.7.1 Message rejected.)

   ----- Transcript of session follows -----
... while talking to [192.168.216.11]:
>>> DATA
<<< 550-5.7.1 Message rejected.
<<< 550 5.7.1 Failed on SPF check (SPF Fail), the IP address 189.79.89.167 is not authorized to send in the name of domain "ietf.org".
554 5.0.0 Service unavailable