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We are aware of an issue that is preventing email from being sent to @hotmail.com and @live.com recipients.  When sending an email to one of these domains, you may receive an email from “Mail Delivery System” with the subject “Mail delivery failed: returning message to sender” with the following message:

host mx4.hotmail.com [65.55.92.152]: 550 SC-001 (SNT0-MC2-F50) 
Unfortunately, messages from **.**.***.*** 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.

We are working hard to resolve this issue and we will keep you posted on any progress.

We apologize for any inconvenience this issue may cause.

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