在雅虎的发布声明中，该公司表示已采用域名密匙（DomainKey）反垃圾邮件技术，来提高抵御垃圾邮件伪造地址和“钓鱼式（phishing）”攻击的能力。
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Like many other companies, Google uses a system called DomainKey Identified Mail (DKIM) to validate that mail sent from Google.com really comes from Google, and not from a scammer pretending to be Google.
FORBES: Google Says Google Apps Domains Were Protected From Massive Spoofing Vulnerability
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