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Date: Wed, 07 Nov 2012 10:47:34 +0400
From: Mail Delivery System <Mailer-Daemon@mx183.mail.ru>
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Это письмо создано автоматически сервером Mail.Ru, отвечать на него не нужно.

К сожалению, Ваше письмо не может быть доставлено одному или нескольким получателям, потому что:

  Message was not accepted -- invalid mailbox.
 Local mailbox userx@example.ru is unavailable: user not found

**********************

A message that you sent was rejected by the local scanning code that
checks incoming messages on this system. The following error was given:

  Message was not accepted -- invalid mailbox.
 Local mailbox userx@example.ru is unavailable: user not found

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