Delivery failure to one domain

T

tedmi

Outlook 2007. Sending to ONE particular domain always fails with this message:

Mail System Error - Returned Mail
The reasons given by the server are included to help you determine why each
recipient was rejected.

Recipient: <[email protected]>
Reason: 5.7.1 <eastrmmtao102.cox.net[68.230.240.8]>: Client host
rejected:
r No SMTP on dial-ups *.cox.net

The ISP is Cox Communications, via cable modem, not dial-up. Contacted them,
but they do not support users of Office Outlook.
Sending from Outlook to all other addresses works fine, and sending to this
domain via webmail also works!
Any help greatly appreciated.
 

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