Yahoo wont let me send to hotmail :(?

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email hosting

Yahoo wont let me send to hotmail :(? [Imwebhost]

when i send to hotmail about 3 minutes later i get an email saying that it wasnt sent because ''Sorry, we were unable to deliver your message to the following address''

It also says ''Remote host said: 550 SC-004 Mail rejected by Windows Live Hotmail for policy reasons. A block has been placed against your IP address because we have received complaints concerning mail coming from that IP address. If you are not an email/network admin please contact your''