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An estimated 9 out of 10 HTML emails are not W3C HTML compliant, which can cause rendering as well as delivery issues, particularly at MSN and Hotmail. One of the dirtiest tricks in a spammer's arsenal is invalid, broken, and malicious HTML code, used to obfuscate his payload. If you use HTML in your messages, make sure your code is error-free and follows W3C HTML guidelines.
Use the HTML validator in your email application or third-party validator such as The W3C Markup Validation Service.
Also avoid scripting. Security risks due to script vulnerabilities in email browsers have increased over the years. The result is most scripts, such as JavaScript and VBScript, are stripped out of messages. Some email systems reject messages outright if scripting is detected. For greatest compatibility, avoid using scripts in messages. Instead, drive your readers to your Web site, where dynamic components are easily rendered.
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