Адрес [email protected] на самом деле существует, письма с него форвардятся 
администратору, так что проверку на реальность существования он проходит

в логе одна строчка:

2010-06-26 03:20:03 H=db.hostarium.com (s7.grid.hostarium.com) 
[213.239.214.171] F=<[email protected]> rejected RCPT <c****[email protected]>: 
relay not permitted

само письмо в виде отлупа:

From: Mail Delivery System <[email protected]>
To: [email protected]
Subject: Mail delivery failed: returning message to sender
Date: Sat, 26 Jun 2010 03:20:03 +0000

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

  c****[email protected]
    SMTP error from remote mail server after RCPT TO:<c****[email protected]>:
    host hostarium.com [78.47.78.160]: 550 relay not permitted

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

Return-path: <[email protected]>
Received: from postgres by s7.grid.hostarium.com with local (Exim 4.71)
        (envelope-from <[email protected]>)
        id 1OSLw3-0007Z2-Hr
        for c****[email protected]; Sat, 26 Jun 2010 03:20:03 +0000
Date: Sat, 26 Jun 2010 03:20:03 +0000
Message-Id: <[email protected]>
Content-Type: text/plain; charset=UTF-8
To: Cattetti <c****[email protected]>
X-Priority: 1 (Highest)
Subject: Услуги отключены
From: Robot <[email protected]>

[тут текст письма, поскипан]


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