Email on Acid is a useful developer tool to test emails in order to be rendered correctly in every inbox. If your email looks great in browser it doesn’t mean that will be rendered correctly in any client. Email clients are stricter to HTML and CSS standards unlike web browsers.
The tool helps in making a code based analysis that prompts the ins and outs of what is supported by each client. Email on Acid allows you to preview your email in 8 operating systems, 6 web browsers, and 32 email clients - all within one click.
Get tool at http://www.emailonacid.com.