在这个阶段讯息已被序列化，并只提供做为资讯。
At this stage the message has already been serialized and is provided as information only.
有些讯息包含的资讯只在特定期间内有效。
Some messages contain information that is valid only for a particular period of time.
指定电子邮件讯息附件的媒体类型资讯。
Specifies the type of image data in ane-mail message attachment.
指定电子邮件讯息附件的媒体类型资讯。
Specifies the type of image data in ane-mail message attachment.
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