Problem with mail account

Hello good morning everyone.

I have a problem with the email accounts for the domain server. All work correctly except the server's own domain, this account can send mail but can not recivirlos. if you send an email debuelve this error:

Code:

This is the mail system at host oxxxxno.com.

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

<[email protected]>: unknown user: "juan"

Reporting-MTA: dns; oxxxxno.com
X-Postfix-Queue-ID: BDABF8A3093
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Wed,  2 Jul 2014 15:58:15 +0200 (CEST)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.1.1
Diagnostic-Code: X-Postfix; unknown user: "juan"

Return-Path: <[email protected]>
Received: from localhost (localhost [127.0.0.1])
	by oxxxxxxno.com (Postfix) with ESMTP id BDABF8A3093
	for <[email protected]>; Wed,  2 Jul 2014 15:58:15 +0200 (CEST)
X-Virus-Scanned: Debian amavisd-new at ns1.oxozono.com
Received: from oxxxxxxno.com ([127.0.0.1])
	by localhost (oxxxxxno.com [127.0.0.1]) (amavisd-new, port 10024)
	with ESMTP id 2yqFtJQvV9xe for <[email protected]>;
	Wed,  2 Jul 2014 15:58:15 +0200 (CEST)
Received: by oxxxxno.com (Postfix, from userid 33)
	id 63AD08A315E; Wed,  2 Jul 2014 15:58:15 +0200 (CEST)
To: <[email protected]>
Subject: Re: proba
X-PHP-Originating-Script: 0:main.inc
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8;
 format=flowed
Content-Transfer-Encoding: 8bit
Date: Wed, 02 Jul 2014 15:58:15 +0200
From: [email protected]
In-Reply-To: <[email protected]>
References: <[email protected]>
Message-ID: <[email protected]>
X-Sender: [email protected]
User-Agent: Roundcube Webmail/0.7.2

The DNS domain are configured on the outside as well:



And on the server as follows:



That may be happening?

Thanks in advance.


regards

 

Hello again.
thank you very much, what I had missed my file was main.cf.
With your clarification and works perfectly.
Thank you so much.