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I keep getting this error when I send mail to xxxx@yyyy.com.
'The following message to <xxxx@yyyy.com> was undeliverable.
The reason for the problem:
5.1.0 - Unknown address error 554-'mail from aa.aa.aa.aa refused, see http://www.spamcop.net''
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aa.aa.aa.aa is the public ip address of my mail server. I am getting this error when I send mail to only this specific address. I have checked spamcop.net and my IP is not listed.
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5.1.0 - Unknown address error 554-'mail... 
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