我有一台运行 ISPConfig 3.1.2 的服务器，它托管大约 8 个站点（一些 Wordpress 一些自定义）。
在过去的一个月里，我收到了服务器主机名的垃圾邮件。例如，我有一个名为 server3.myserver.co.uk 的服务器。我从未在此域中设置任何电子邮件帐户，但我的电子邮件来自 Samuel@server3.myserver.co.uk 和 Justin@server3.myserver.co.uk。
这些电子邮件通常试图销售男性药丸。一个示例主题是“男性药片评论与建议”。
我试图查看我的服务器是否有一个开放的中继，但它没有。我还使用 grep 和垃圾邮件地址搜索了日志和电子邮件，但找不到问题的根源。
有人可以帮我下一步尝试吗？
如果有帮助，我已经添加了一个示例电子邮件标题。
Return-Path: <urlpoesx@heijmans.nl>
Delivered-To: jason@mywebsite.co.uk
Received: from localhost (localhost.localdomain [127.0.0.1])
by ks3.myhosting.co.uk (Postfix) with ESMTP id 634971A40231
for <jason@mywebsite.co.uk>; Sun, 15 Jan 2017 12:58:58 +0000 (GMT)
X-Virus-Scanned: Debian amavisd-new at ks3.myhosting.co.uk
X-Amavis-Alert: BAD HEADER SECTION, Missing required header field: "Date"
Received: from ks3.myhosting.co.uk ([127.0.0.1])
by localhost (ks3.myhosting.co.uk [127.0.0.1]) (amavisd-new, port 10024)
with ESMTP id 5r6uaFTvDmKE for <jason@mywebsite.co.uk>;
Sun, 15 Jan 2017 12:58:55 +0000 (GMT)
Received: from heijmans.nl (unknown [61.182.116.30])
by ks3.myhosting.co.uk (Postfix) with ESMTP id E39291A4022D
for <jason@mywebsite.co.uk>; Sun, 15 Jan 2017 12:56:45 +0000 (GMT)
X-Message-Info: 1jHVeH08Utdgiu2vViM0IP3sZghafT51
Received: from dns4.heijmans.nl ([172.54.74.57]) by hw0-a5.heijmans.nl with Microsoft SMTPSVC(5.0.2195.6824);
Sun, 15 Jan 2017 04:50:58 -0800
Received: from zsl.heijmans.nl [127.0.0.1] by dns5.heijmans.nl
(SMTPD32-7.12 ) id HX082315D5; Sun, 15 Jan 2017 04:50:58 -0800
Subject: Effective male enhancement
From: Justin@ks3.myhosting.co.uk
To: jason@mywebsite.co.uk
Message-Id: <853057187136552.WF62685@lfvl.heijmans.nl>
Content-Type: text/html;;
Content-Transfer-Encoding: 7Bit
Date: Sun, 15 Jan 2017 12:58:58 +0000 (GMT)