清单8：使用mbox_sha1sum防止获得电子邮件地址。
Listing 8: Using mbox_sha1sum to protect E-mail addresses from harvesting.
一般来说2/3的人使用留言页面并不是为了获得电子邮件的功能，而很大一部分原因在于“告知”，那些签名可以让我了解到究竟谁看过这个页面？
It turns out that 2/3 of people use comments pages not the email functionality. Part of this is for show, signalling that I know this person.
该适配器检查邮件服务器上的邮箱，以获得电子邮件消息，或者将电子邮件消息发送到邮件服务器，并在电子邮件消息和业务对象之间进行转换。
It checks the mailboxes on mail servers for E-mail messages, or sends E-mail messages to a mail server, and converts between E-mail messages and business objects.
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