[Exim] 501 <root@kebian>... Sender domain must exist

I've changed alias

root:ke_an@???

and sent a message to ke_an@???
from root. Message didn't reach
ke_an@???, but message created
automatically by mail delivery
software reached ke_an@???.
(I did it twice and
used two different smtp servers)
I suppose this is a problem of the netwok
configuration in my linux system.
(not exim's)

Thank you very much fo support.

I've got such messages back:

_________________________________________________

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to all of its recipients. The
following address(es) failed:

  ke_an@???:
    SMTP error from remote mailer after RCPT TO:
    <ke_an@???>:
    host puni.osf.lt [193.219.244.164]:
    550 5.7.1 <ke_an@???>... Relaying denied. IP name lookup failed
[195.182.95.73]

------ This is a copy of the message, including all the headers. ------

Return-path: <root@kebian>
Received: from root by kebian with local (Exim 2.05 #1 (Debian))
        id 12GrXH-00003V-00; Sat, 5 Feb 2000 00:49:08 +0200
Message-Id: <E12GrXH-00003V-00@kebian>
From: root <root@kebian>
To: ke_an@???
Date: Sat, 5 Feb 2000 00:49:08 +0200
________________________________________________________________

and another:


This message was created automatically by mail delivery software.

A message that you sent could not be delivered to all of its recipients. The
following address(es) failed:

  ke_an@???:
    SMTP error from remote mailer after MAIL FROM:
    <root@kebian> SIZE=1312:
    host perkunas.omnitel.net [205.244.196.2]:
    501 <root@kebian>... Sender domain must exist

------ This is a copy of the message, including all the headers. ------

Return-path: <root@kebian>
Received: from root by kebian with local (Exim 2.05 #1 (Debian))
    id 12GreK-00005O-00; Sat, 5 Feb 2000 00:57:03 +0200
From:mi_ga@???
To:ke_an@???
Subject:just test
Message-Id: <E12GreK-00005O-00@kebian>
Sender: root <root@kebian>
Date: Sat, 5 Feb 2000 00:57:03 +0200

aaa







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