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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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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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I am still waiting to test teh SPF.
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Do you have SPF setup at the moment?
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The SPF setup seemed to help. &nbsp;Thanks.
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Excellent news - thanks for the points.
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I am trying to e-mail a client at regaengineering.com, and I am recieveing the following error message sometimes. &nbsp;Can someone look at this domain and tell me what needs to be done. &nbsp;I am trying to email them via a google apps account and it does work sometimes.<br />
<br />
&quot;Technical details of permanent failure:<br />
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).&quot; <br />
<br />
Also, on the client site GFI mail essentials is running for spam blocking.<br />
<br />
Thanks,<br />
Ryan
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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

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

Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.

Email Servers

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.

Exchange

An email client, email reader or more formally mail user agent (MUA) is a computer program in the category of groupware environments used to access and manage a user's email. A web application that provides message management, composition, and reception functions may internally act as an email client; as a whole, it is commonly referred to as webmail. Likewise, email client may be referred to a piece of computer hardware or software whose primary or most visible role is to work as an email client. Email clients can also have other systems, like calendars, notes and contact managers.