y3k_condor

Добрый день.
Есть связка на debian 6 ( dbmail mysql postfix sasl ...)
почта настроена, отправляет и принимает письма с любых доменов всё без проблем, но когда пытаюсь отправить письмо на адрес postmaster@мой.домен, как снутри так и снаружи приходит ответное письмо такого содержания. В чём может быть проблема.

This is the mail system at host mail.vkmp.by.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<condor@vkmp.by> (expanded from <postmaster@vkmp.by>): host 127.0.0.1[127.0.0.1]
said: 550 Recipient <condor@vkmp.by> FAIL (in reply to RCPT TO command)
Reporting-MTA: dns; mail.vkmp.by
X-Postfix-Queue-ID: AACC947E4E5
X-Postfix-Sender: rfc822; head_asu@vkmp.by
Arrival-Date: Thu, 7 Nov 2013 11:36:59 +0300 (FET)

Final-Recipient: rfc822; condor@vkmp.by
Original-Recipient: rfc822;postmaster@vkmp.by
Action: failed
Status: 5.0.0
Remote-MTA: dns; 127.0.0.1
Diagnostic-Code: smtp; 550 Recipient <condor@vkmp.by> FAIL