Ondata di mail anomale su libero. Cosa significa?

[garat]

Da anni uso libero come client di posta ma questa cosa non mi era mai successa.

Ho ricevuto improvvisamente circa 300 mail, alcune più o meno con questo contenuto:

抱歉，您的邮件被退回来了……
原邮件信息： 　
时　间： 2012-05-25 01:03:07
主　题： 可口可乐（Coca Cola）公司销售经理讲授-xylk
收件人： crazy111@yeah.net
退信原因：
垃圾邮件让邮箱小易很烦心，现在您发送的邮件被怀疑为是垃圾邮件，拒绝接收。
英文说明:rejected by system.(rejected by system)
建议解决方案：

邮差小易建议您绿色地使用邮箱，请适当修改标题和内容，再尝试发送
如果您有其他退信问题，欢迎向网易邮件中心发送退信报告
----------------
This message is generated by Coremail.
您收到的是来自 Coremail 专业邮件系统的信件.

...altre con questo come oggetto: Mail delivery failed: returning message to sender

e questo come testo:
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:

7776sun.vip@163.com
SMTP error from remote mail server after RCPT TO:<7776sun.vip@163.com>:
host 163mx01.mxmail.netease.com [220.181.12.90]:
550 User not found: 7776sun.vip@163.com

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

Return-path: <perugia@acuumbria.org>
Received: from [219.129.24.226] (helo=boqrstb)
by da40.joomlahost.it with esmtpa (Exim 4.69)
(envelope-from <perugia@acuumbria.org>)
id 1SXbV3-0004pP-5u; Thu, 24 May 2012 19:06:58 +0200
Message-ID: <D60299167CC03D6EBB0D6E36DEEFCD40@boqrstb>
From: =?gb2312?B?zfjS19PKz+Q=?= <perugia@acuumbria.org>
To:
Subject: =?gb2312?B?vfHI1dDCzsU=?=
Date: Fri, 25 May 2012 01:07:28 +0800
MIME-Version: 1.0
Content-Type: text/html;
charset="gb2312"
Content-Transfer-Encoding: base64
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.5512
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512

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Che cosa può essere successo?
Grazie in anticipo

[garat]

Ho ricevuto un'altra ondata di mail da questo indirizzo

Mailer-Daemon@da40.joomlahost.it

con questo testo:

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:

1542389334@qq.com
SMTP error from remote mail server after RCPT TO:<1542389334@qq.com>:
host mx3.qq.com [112.95.241.33]: 550 Mailbox not found. http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=20022&&no=1000728

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

Return-path: <perugia@acuumbria.org>
Received: from [140.240.0.70] (helo=yahoo.com.cn)
by da40.joomlahost.it with esmtpa (Exim 4.69)
(envelope-from <perugia@acuumbria.org>)
id 1SXlSJ-0001qL-9V; Fri, 25 May 2012 05:44:48 +0200
Message-ID: <25BECCD730FF66BEF5385260DA08E212@yahoo.com.cn>
From: "2012-05-25 11:44:34" <perugia@acuumbria.org>
To: <806479053@qq.com>
Subject: 2012-05-25 11:44:34perugia@acuumbria.org
Date: Fri, 25 May 2012 11:44:37 +0800
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0FFB_01D081E3.16565900"
X-Priority: 1
X-MSMail-Priority: High
X-Mailer: Microsoft Outlook Express 6.00.2900.5512
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5512

This is a multi-part message in MIME format.

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Ma cosa significa? Qualcuno sa aiutarmi? non so come difendermi

[Chill-Out]

La prima cosa da fare in questi casi è cambiare Password.

[garat]

è la prima cosa che ho fatto, ma il flusso di mail non si è interrotto

[xcdegasp]

se proviene da un sito che amministri allora controlla il server host perchè contiene uno script estraneo