在处理电子邮件和附件时，您可能已经遇到过MIME类型，但MIME规范描述了识别数据格式的更通用的机制。
You may have run across MIME types when working with E-mail and attachments, but the MIME specification describes a more general-purpose mechanism for identifying data forms.
您还将遇到安全电子邮件服务中的一些helper类，这些helper类处理XML和各种安全问题，如创建XML的规范格式和计算摘要值。
You will also come across a few helper classes in the secure email service that handles XML and security issues like authoring canonical form of XML and calculating digest values.
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