PLESK/MailEnable SPAM Issue sending emails out

Hi Experts,

I use PLESK 11.0.9 with MailEnabale 8, recently I noticed one of the domain's is sending out thousands of SPAM emails out, I have disabled the email service of this domain name but still I can see it's sending emails out and bounced to the postmaser address when it's fail to send.

Please help me to resolve this and what are the information you need ?

Below is one of the emails I get in to my inbox;

MailEnable: Message could not be delivered to some recipients.
The following recipient(s) could not be reached:

	Recipient: [SMTP:mrfish@gmx.net]
	Reason: Remote SMTP Server Returned: 550 Requested action not taken: mailbox unavailable 


Message headers follow:

DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=default; d=companydns.com; b=kR6r45/cAzRqIdc87t9odDhtFS5AZMc5vEkKOSJfQaRdcRVssNTC5amOlBJqhVg0jnTC9BvL/wh5wMZwPvE30SI+/OQ0Q8DcRhHX61jJKmJN6EKjln0KbJ83iZ0RF7Ey; h=Received:Date:Subject:To:X-PHP-Originating-Script:From:X-Mailer:Reply-To:Mime-Version:Content-Type;
Received: from PLESK-WIN.companytechnologies.local ([127.0.0.1]) by companydns.com with MailEnable ESMTP; Wed, 24 Dec 2014 21:43:41 +0530
Date: Wed, 24 Dec 2014 16:13:41 +0000
Subject: Busty blonde likes it in outdoor
To: mrfish@gmx.net
X-PHP-Originating-Script: 0:.page46.php(233) : eval()'d code
From: "Aiden Hicks" <support@companydns.com>
X-Mailer: Oudmlr(ver.3.4)
Reply-To: "Aiden Hicks" <support@companydns.com>
Mime-Version: 1.0
Content-Type: multipart/alternative;boundary="----------1419437621549AE635C800E"

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