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550 550 5.7.1 Requested action not taken: message refused (state 18)

I am trying to e-mail a client at regaengineering.com, and I am recieveing the following error message sometimes.  Can someone look at this domain and tell me what needs to be done.  I am trying to email them via a google apps account and it does work sometimes.

"Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.7.1 Requested action not taken: message refused (state 18)."

Also, on the client site GFI mail essentials is running for spam blocking.

Thanks,
Ryan
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rlindbeck
Asked:
rlindbeck
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1 Solution
 
jakersCommented:
You might need to tell their IT manager to whitelist your e-mail address. Their spam filter could be blocking your address
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Alan HardistyCommented:
Please check your domain against the checks in my article.  It seems that your domain is not setup properly, is blacklisted, or does not have SPF setup.

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/A_2427-Problems-sending-mail-to-one-or-more-external-domains.html
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rlindbeckAuthor Commented:
I am still waiting to test teh SPF.
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Alan HardistyCommented:
Do you have SPF setup at the moment?
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rlindbeckAuthor Commented:
The SPF setup seemed to help.  Thanks.
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Alan HardistyCommented:
Excellent news - thanks for the points.
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