[Comm] Письма от Postfix

[Dima Vukolov <dvukol@rosmail.ru>]

Подскажите, если кто знает, почему postfix шлёт мне иногда письма 
следующего содержания:

From MAILER-DAEMON@localhost.localdomain Tue Dec 17 20:36:09 2002
Return-Path: <double-bounce@localhost.localdomain>
Delivered-To: root@localhost.localdomain
Received: by localhost.localdomain (Postfix)
	id EA0D553AFA; Tue, 17 Dec 2002 20:36:09 +0300 (MSK)
Date: Tue, 17 Dec 2002 20:36:09 +0300 (MSK)
From: MAILER-DAEMON@localhost.localdomain (Mail Delivery System)
To: postmaster@localhost.localdomain (Postmaster)
Subject: Postfix SMTP server: errors from unknown[61.111.4.42]
Message-Id: <20021217173609.EA0D553AFA@localhost.localdomain>
Status: R 
X-Status: N
X-KMail-EncryptionState:  
X-KMail-SignatureState:  

Transcript of session follows.

 Out: 220 localhost.localdomain ESMTP Postfix
 In:  ehlo c-cz64os498w1ad
 Out: 250-localhost.localdomain
 Out: 250-PIPELINING
 Out: 250-SIZE 10240000
 Out: 250-ETRN
 Out: 250-XVERP
 Out: 250 8BITMIME
 In:  Rset
 Out: 250 Ok
 In:  Mail from:<china9988@21cn.com>
 Out: 250 Ok
 In:  RCPT to:<china9988@21cn.com>
 Out: 554 <china9988@21cn.com>: Recipient address rejected: Relay 
access denied
 In:  Quit
 Out: 221 Bye

или так:

Transcript of session follows.

 Out: 220 localhost.localdomain ESMTP Postfix
 In:  HELO yahoo.com
 Out: 250 localhost.localdomain
 In:  MAIL From: <ghjsh6so5498y7uohjl@ygahjkoo.com>
 Out: 250 Ok
 In:  RCPT To:<eabgroupcoastal@yahoo.com>
 Out: 554 <eabgroupcoastal@yahoo.com>: Recipient address 
rejected: Relay access denied
 In:  QUIT
 Out: 221 Bye

-- 
Dima Vukolov