Unsolicited email or spamcan be damaging to the reputation of your business.
非客户要求的email或垃圾邮件会损害你的名誉。
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Most search engines will devalue pages with such messages, or with links to sites associated with spam, which means that spamcan reduce your search engine optimization.
It is almost impossible to rely on a single one of the techniques above to identify spam perfectly, but you can increase the quality of the spam filter by using combinations.