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jbobst

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Undeliverable email - trying to understand the problem

We have our own Exchange 2003 server.  The last two days one of our sales guys has been trying to send an email to a client.  He can successfully send it to the client over his personal gmail account, but when sending from our office, he get's the following reply from "System Administrator":

The following recipient(s) cannot be reached:

     client@hisdomain.com on 7/11/2013 9:26 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            <mail.ourdomain.com #5.7.1 smtp;554 5.7.1 <wsip-ouripaddress.ph.ph.cox.net[ouripaddress]>: Unverified Client host rejected: COX residential IP addresses prohibited>

Why don't we "have permission to send to this recipient"?  Is this email being rejected because the person we are trying to send the email to doesn't accept email from people who use Cox as their ISP?  Is this telling me that it thinks we have a "residential" IP address from Cox?  Cox is our ISP, but we have a business account with them.  Why can't these emails be less cryptic and just plainly state the problem?

Thanks for any help...
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jbobst

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By the way, I obviously changed his real email address to "client@hisdomain.com" and removed our IP address from the auto reply message.  If it can help to give out this information in order to figure out the problem, let me know.
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Dave Baldwin
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Just called Cox...they of course said the same thing, that they are not allowing our emails on their end, and that I need to contact them and see if they can put an exception in their security rules for our emails.

Cox said they didn't know why it said residential, and of course weren't very helpful in per suing anything on their end to help.
Well, it was worth a shot, but I'm not surprised that they weren't very helpful.  The primary job of the phone answerers is prevent customers from bothering the engineers.
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Thanks for the help.  Have contacted the other company and am waiting for them to "allow" us.
I Googled to see if "COX residential IP address" brought anything useful and it didn't.  Thanks for the points.