使用CSS.

<table width="100%" border="0" style="word-break:break-all; table-layout: fixed;border-collapse: collapse; border-style: solid; border-width: 1; padding: 0" bordercolor="#C0C0C0" cellpadding="0" cellspacing="0" height="1">

关键:“word-break:break-all”以及 " table-layout: fixed"