troubleshooting Question

Undeliverable email - trying to understand the problem

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jbobst asked on
ExchangeEmail ProtocolsEmail Clients
6 Comments1 Solution613 ViewsLast Modified:
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: on 7/11/2013 9:26 AM
            You do not have permission to send to this recipient.  For assistance, contact your system administrator.
            < #5.7.1 smtp;554 5.7.1 <[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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