RAZOR2_CHECK
最近在发邮件前都用河马大大推荐的http://www.mail-tester.com 工具进行测试垃圾邮件指数，RAZOR2_CHECK指数特别高，百度了下 也没有明白 求各位指导
SpamAssassin thinks you can improve The famous spam filter SpamAssassin. Score: -2.4.
A score below -5 is considered spam.
-0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid
This negative score will become positive if the signature is validated. See immediately below.
0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
Great! Your signature is valid
0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain
Great! Your signature is valid and it's coming from your domain name
-0.805 HTML_IMAGE_RATIO_02 HTML has a low ratio of text to image area
You should write more text in your e-mail or remove some pictures
-0.001 HTML_MESSAGE HTML included in message
No worry, that's expected if you send HTML e-mails
-1.729 RAZOR2_CHECK Listed in Razor2 (http://razor.sf.net/)
0.0001 RCVD_IN_DNSWL_NONE Sender listed at http://www.dnswl.org, low trust
Dnswl.org is a whitelist, being listed on this service is good
0.001 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain
0.001 SPF_PASS SPF: sender matches SPF record
Great! Your SPF is valid
-0.01 T_REMOTE_IMAGE Message contains an external image
tongqiu同求 链接黑名单
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