SPAM from freebsd-questions

[CK]

I just posted about data loss, and got 3 spam emails from China
instantly.  And when I posted 2 months ago or so, I got the same
spam emails from China.  How is China finding out email addresses
of everyone that posts to freebsd-questions, and can the SPAM be
stopped?  These are the 3 emails I just got from posting:

To:         <taogediyi at sina.com>
Cc:
Bcc:
Subject:    =?utf-8?B?6Ieq5Yqo5Zue5aSN77yaRW5kbGVzcyBEYXRhIExvc3M=?=
Reply-To:
X-Mailer:   UMail v1.0

> Return-Path: taogediyi+==bmliYmFuYUBnbXgudXM===@sina.com
> Received: from mail2-182.sinamail.sina.com.cn ([60.28.2.182]) by mx-ha.gmx.net
>  (mxgmx006) with ESMTP (Nemesis) id 0La3rR-1Ye1hY0AZB-00lp8w for
>  <email-deleted>; Sat, 25 Jul 2015 09:34:21 +0200
> Received: from mda04.fmail.tg.sinanode.com ([172.16.113.64])
>   by irtj11-93.sinamail.sina.com.cn with ESMTP; 25 Jul 2015 15:34:14 +0800
> Received: by mda04.fmail.tg.sinanode.com (Postfix, from userid 99)
> 	id 4FE062C0051; Sat, 25 Jul 2015 15:34:14 +0800 (CST)
> Auther: VipMail_1.0 (REM)
> Sender: taogediyi+==bmliYmFuYUBnbXgudXM===@sina.com
> MIME_version: 1.0
> Content-type: text/plain; charset=utf-8; format=flowed
> Content-transfer-encoding: base64
> Message-Id: <20150725073414.4FE062C0051 at mda04.fmail.tg.sinanode.com>
> Date: Sat, 25 Jul 2015 15:34:14 +0800 (CST)
> Envelope-To: <email-deleted>
> X-GMX-Antispam: 0 (Mail was not recognized as spam); Detail=V3;
> X-GMX-Antivirus: 0 (no virus found)
> X-UI-Filterresults: notjunk:1;V01:K0:sOXm2Tl+hK0=:CHL1J7JcL4F9bMJFWXYn/QpNfz
>  1ItyJxcAJyLErRtsdId8W7Genq/2mQXc2+6FAymkGnxv8ZAa5hxs51RUufL0BTSJ8sUOQR51t
>  n0WK7EpSqedo/M9983cNCxmkJW55FO9STwA2R+/jbQoSOTsjvVYFNXt6AHUIUbC4LOsby90Cr
>  dcE/ostR+ri/ojHY3Xbha9E8lVv2orFVbKIocnPp6KhpuyGz7BYqleGskVl+bvTPt70atcN/Q
>  66PI4NOH3CsukT41rwCAqk+r90Fjo79pXCCpSTHcVlHL/PQx10UvBXmIs3M1Is1pGJfdqdl+W
>  r+SjFsyEYkPJ0azhTDO+zzfW/gPUYM/x7aS3UIvGFv8EUeVEAAkk+wSpEbn2QpY0lzDiNHa/T
>  SymzvECHDAjyLM51SHtu14AF12ADzXJKYBZDZSJyDa19GzVcCHD827Ns2nL6/Y8q5OEg5D8q1
>  HvN6rITr4JvuP1XwieUXJGKtN50RzDxS63KC2SmTnRhn0Dchhaft8SDajlRb/BvVTe6UtyLcx
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>  soT1ue+bTLOMDvZjIchoqgUSJD869Wxz9NQgNMpU7XxwP8P5Xi0PP5Jh8eiq583lPMHnaTzR3
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>  PqE2vmAfCUupEC4WWdwtxE3p3cjgdZOIy+CLv/CQslmt6dZLz/pvuJNwsps1uMaCgK9ID9NM4
>  7BE6nZivMsLpwz941FAwOqdWGlgmjDIXw3uH7wDRpw2YzoOUXJBWusNXb86W6laH34Uds41MU
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>  Cp3mA+/+cKAT1SuVp6HiYtisPTHOAPLQT4+Af9B1c9EENHcC06J0RH6tTGMIhDcgq6p4FuYor
>  cd4euKNi8CBF9pwpdR/FIF/eHm/njbkFXL26F8nRQMO8I5KFuR/kiSSQel6GInloszOUxjlx2
>  2XWdq5OLK4zuwEzpA==

> 5oKo5aW977yM5oKo55qE5p2l5L+h5bey6KKr6Z+s5ZOl5Zui6Zif5pS25Yiw77yM6K+36ZqP5pe2
> 5YWz5rOoUVHnvqTjgIHnvZHmoKHmlrDpspzkuovnrYnnmoTlpZblirHkv6Hmga/lj5HluIPvvIzo
> sKLosKLlj4LkuI7vvIE=

To:         <jzsf at vip.sina.com>
Cc:
Bcc:
Subject:    =?utf-8?B?6Ieq5Yqo5Zue5aSN77yaRW5kbGVzcyBEYXRhIExvc3M=?=
Reply-To:   <email-deleted>
X-Mailer:   UMail v1.0

> Return-Path: jzsf+==bmliymfuyubnbxgudxm===@vip.sina.com
> Received: from smtp546-46.vip.sina.com.cn ([202.108.3.67]) by mx-ha.gmx.net
>  (mxgmx006) with ESMTP (Nemesis) id 0MUlFk-1ZQc6t1lqm-00Y9y1 for
>  <email-deleted>; Sat, 25 Jul 2015 09:34:24 +0200
> Received: (qmail 4422 invoked by uid 542); 25 Jul 2015 15:34:19 +0800 (CST)
> SMAIL-SPAM-FILTER: 4421 OK; Sat, 25 Jul 2015 15:34:19 +0800 (CST)
> X-SGroup: ow
> Received: from unknown( HELO agent01.agent.vmail.yz.sinanode.com)([172.16.53.127])
> 	by vip.sina.com with SMTP
> 	25 Jul 2015 15:34:19 +0800 (CST)
> X-Sender: jzsf+==bmliymfuyubnbxgudxm===@vip.sina.com
> X-SMAIL-MID: 1343592019548
> Received: by agent01.agent.vmail.yz.sinanode.com (Postfix, from userid 99)
> 	id 066A9D70118; Sat, 25 Jul 2015 15:34:18 +0800 (CST)
> Auther: VipMail_1.0 (REM)
> Sender: jzsf+==bmliYmFuYUBnbXgudXM===@vip.sina.com
> MIME_version: 1.0
> Content-type: text/plain; charset=utf-8; format=flowed
> Content-transfer-encoding: base64
> Message-Id: <20150725073418.066A9D70118 at agent01.agent.vmail.yz.sinanode.com>
> Date: Sat, 25 Jul 2015 15:34:18 +0800 (CST)
> Envelope-To: <email-deleted>
> X-GMX-Antispam: 0 (Mail was not recognized as spam); Detail=V3;
> X-GMX-Antivirus: 0 (no virus found)
> X-UI-Filterresults: notjunk:1;V01:K0:JZH9c9iTch0=:V7iRKOIZ4mu2OeloRN4aTnYftf
>  zVNLzYOGD7jOn/qX3gIw1bxeGg7wFgBTjTuzHCo4RJDR3AC9H3PR7e17E+fyiFnvwrcfJhlyL
>  Y6DeUhoxKiaf+SF7JNdqS8wGFvuyVB9eH+YkR6cqHuT5rLghKtx+NOBjcYWSZRnpz2XOGPcip
>  OJaXbJN3HIO0zRv8rojAPRYUE2N1wcqB+wUFokGpCQJ2UbH5wq3ECjfFDrd39jJ+iWxJynskX
>  MOHim97qfoXVDs6gLhAF4ZKotef9lv4P0KB4KlROaCejbKAirT5TMHZvWq4NYJlHfkN3gYk3a
>  vp+NodjpjXfjfUM6VKGZP/m6wAp7pRda7dMjNJEjhwioOGURoMArALBm7qnXl2IoSpq9ruw+/
>  Jw4NoVxH7yGeD/L6VRbi3toZr/pM1ibhgjmsPP6khqhsNf9rb7DoV/1j+YLvvX3R14t5IZJxO
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>  wau2Y+41RXMGN2nO8TiZO602qoVD+QvKN+40leSCx+eSAb/AUx2rkr5cI+Dmw+KQHTXowxosH
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>  BpYEZqiKroV/ZYUgA==

>
> 5bey5pS25Yiw5oKo55qE5p2l5L+h77yBDQogICAgICAgICDosKLosKLvvIENCiAgICAgICAgICAg
> ICDojYblt57nm5vlj5E=
>