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... while talking to mx4.hotmail.com.:
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<<< 550 SC-001 (BLU004-MC1F34) Unfortunately, messages from 207.57.250.189 weren't sent. Please contact your Internet service provider since part of their network is on our block list. You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors.
554 5.0.0 Service unavailable

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Date: Fri, 26 Jun 2015 16:35:25 +0000
From: "Administrative User" <cavs08@avan-c.com>
To: antonio_vivanco_lemus@hotmail.com
Subject: Prueba viernes 11.37

This isn't on-topic for this forum. You need to go to http://mail.live.com/mail/troubleshooting.aspx#errors and review the information there. Included is a link to contact support if you believe you are following all of the guidelines and policies. See the Sender services, tools, and issue submission section of that article.