You can send the HTML emails with Flash files in them, but the majority of your recipients won’t be able to view them. This is because only Microsoft Outlook and Apple Mail use the operating system’s built-in browsers to render their email. Other email applications use their own, proprietary ways of rendering HTML. Plus, most people have anti-virus and anti-spam applications that block the code used to embed Flash files.

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The recipients will be viewing your email newsletter in different email applications which render HTML email differently. For this reason, you need to test your email first and make sure it works in as many different email applications as possible. There are many email applications out there and they all render HTML email in different sometimes unpredictable ways. Do you need to test every single newsletter across every single application, every single time you send? No. Just setup a good, simple, foolproof template and test it as much as possible. In the future all you’ll need to do is to vary the content. It really helps to setup a test computer (or two) in your office. If it’s not possible, send the email to a few friends or office-mates. Just ask them to let you know if anything looks "off" or broken to them.

In the table below we summarize the particularities of most popular email clients. Knowing common issues of various email applications will help you find the optimal HTML design so that you email newsletter is displayed in the suitable way for all the subscribers.

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The Bayesian filter is a recently elaborated anti-spam technique and one of the most important ones. It’s build in so many email applications these days (like Outlook 2003, Mozilla Thunderbird, Apple Mail, G-Lock SpamCombat).

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