您可以指定下表中的属性，借此控制附件控制项的间距和大小。
You can control the spacing and size of the attachment control by specifying the attributes in the following table.
您也能发送具有MIME附件、定制邮件标题以及控制字符集的高级消息。
You can also send advanced messages with MIME attachments, custom mail headers, and controlled character sets.
可以添加基于文档的方法来提供对附件的细粒度控制。
Document based methods can be added to provide fine-grain control on attachment.
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