why I can't receive email?

From: Yahoo mail (c_l_2000@yahoo.com)
Date: Sat Jan 29 2000 - 04:49:07 EST


Here is a newbie's question. I installed Redhat 6.1 with ethernet
connection. I have no problem sending out emails, but when I
try to send emails from outside, those emails were always bouced back
with error message:

Returned mail: Host unknown (Name server: 130.132.197.223: host not found)
The original message was received at Sat, 29 Jan 2000 01:15:14 -0500 (EST)
from net197-222.student.yale.edu [130.132.197.222]

   ----- The following addresses had permanent fatal errors -----
<root@130.132.197.223>

   ----- Transcript of session follows -----
550 <mailto:root@130.132.197.223>... Host unknown (Name server:
130.132.197.223: host not found)

What's wrong? Is there anything I haven't configured correctly? Please help.

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