Cannot send mail from .me or .mac to any hotmail addresses without rejection notice

Since yesterday, I have not been able to send email to anyone with a Hotmail address from my .me/.mac email without getting this notice:
Recipient address: [email protected]
Reason: Server rejected MAIL FROM address.
Diagnostic code: smtp;550 SC-004 (COL0-MC3-F13) Unfortunately, messages from 19.138.187.0 weren't sent. We recommend that you contact your Internet service provider. The problem is that too many unwanted messages have been sent from the following IP address above.
This happened once before and I don't recall how it was resolved.

Hi Rob,
To see if it's your provider, What's my ip... Does your IP math the stated one?
http://www.whatismyipaddress.com/
Start with these three, check SpamCop or SpamHaus to see if your IP is there...
http://spamcop.net/bl.shtml
http://www.spamhaus.org/lookup.lasso
http://www.spamhaus.org/zen/
Sometimes an ISP will bloc a whole other ISP too, if it's the source of too much SPAM.
Might also see this post by Gallomimia...
http://discussions.apple.com/message.jspa?messageID=9465359#9465359
If none of those are it, then report back please.
Also see...
http://www.webhostingtalk.com/showthread.php?t=594086

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These two sentences are in conflict : "I can also send
internal mail
from Exchange
2007 to
Exchange 2013. But
the problem is
that I am unable
to send from Exchange
2007 to
Exchange 2013. "
Can you describe what is your real problem? Flow from E2007->E2013? Or vice versa?
Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you. Thank you! Damir

Cannot send mail from .me or .mac to any hotmail addresses without rejection notice

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