有可能验证某邮箱是否存在吗？
由于之前没启用邮箱验证，所以用户信息中有很多无效邮箱，现在要把邮箱存在的用户标记出来。
邮箱格式是否正确好判断，邮箱域是否存在也能通过socket发个通信确认，可邮箱是否存在该怎么弄？
求解。
------解决方案--------------------
SMTP
我写过，过滤一百万个邮件地址，好多都是国外的
期间也存在许多问题，有些不稳定，第一次回的有第二次又返回的是不存在，我也郁闷
由于安全性原因，现在匿名好像不行了
实现大体过程就是这样的，得参照SMTP协议说明
见我当初写的一篇心得
http://blog.csdn.net/franzhong/article/details/6311654
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