HTML page on SES Email not rendering properly

Hi,

You could look into https://www.htmlemailcheck.com/ or https://mailtrap.io/, but ideally you can validate HTML locally in an IDE or saving the file locally and open it with a browser.

I've had good success using the responsive email templates from Zurg.org.

Outlook does not do a very good job of handling CSS in email. The best practice is to bring all of your CSS inline. There are online tools such as the Juice CSS Inliner that you can use to do this automatically. There are also ways to handle inlining programmatically, such as by using Premailer. The benefit of this approach is that you can integrate it directly into your publishing workflow.

Finally, if you want to preview your email in a variety of email clients and get tips for improving your messages, there's always Litmus.