根据国际电子邮件协会的判定规则：
1、对方未订阅但发件人发送附件的；
2、在一段时间内，发送频率过快，内容重复度过高；
3、未经收件人允许；
4、邮件中含有SPAM高频词；SPAM高频词包含：
Free, Discount, Oppotunity, Win, Winner, Cheap, Deal, Debt, Income, Insurance, Loan, Money, Mortgage, Price, Rate, Profit, Save, Merchant, Stock, ActNow, All New, CallNow, Subscribe Now, Million, Dollars, Opportunity, Compare, Check, Cash, Bonus, Credit, Loans, BuyDirect, Get Paid, OrderNow, Specializing, Specialized, Offer, Please Read, Don'tDelete, Special Promotion, Satisfaction Guaranteed, You've Been Selected.
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