Undeliverable message in outlook 2007, 550 #5.1.0

December 29, 2011 at 20:25:53
Specs: Windows 7
hello all,
when i send a message from my outlook 2007, i receive a notice as follow: Undeliverable

Your message did not reach some or all of the intended recipients.

Subject: testing
Sent: 12/30/2011 11:02 AM

The following recipient(s) cannot be reached:

smith@yahoo.com' on 12/30/2011 11:02 AM
550 #5.1.0 Address rejected smith@yahoo.com

this problem happens while my messages with other domain name in this machine and same outlook deliver without any problem.

thanks in advance,

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February 3, 2012 at 16:44:00
The problem is not on your end. That address is being rejected by the receiving mail exchanger. It could be blacklisted or something.

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