大量购买；很重的邮件A bulk buy; a bulk mailing ..
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a bulk mailing
大量邮寄
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Most bulk mail programs used to manage mailing lists, promotions and other forms of electronic marketing have a test tool that will work out what chance the messages have of getting through industry-standard spam filters.
BBC: Why your inbox fills with bacn instead of spam
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