http://www.campaignmonitor.com/css/ 显示主要电子邮件客户端中支持的所有css。圆角边框甚至没有使它的列表。在页面上有一个指向完整的PDF的链接，其中指出边界半径只在Thunderbird 2中支持

http://www.campaignmonitor.com/css/ displays all css supported in major email clients. rounded borders didnt even make it to the list. On the page there is a link to a full PDF, which notes that border radius is ONLY supported in Thunderbird 2

请注意，您必须将样式嵌入html元素以支持广泛的电子邮件客户端

please note that you have to embed the styles in the html elements to support a broad range of email clients