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Although Java scripts are known to be an exceptional and proprietary element but still it can cause a major problem for the HTML email. The major reasons for this is that there are a wide variety of email clients, updates, browsers, service packs and security settings thereby making it difficult predicting the behavior of the java script against any given email client. It’s quite surprising that Java scripts are actually capable of disabling any kind of active scripting that would be contained in the email document. Therefore it is always advisable to always test the java script that you would be interested in including in your email.

All the email clients are actually not capable of handling the java scripts. And in fact, most of the web based systems are known to disable the script by default just for preventing any kind of malicious code from getting executed in the system. Although you can make use of Java based navigation forms but that is also possible only with the email clients which are not web based. This is because most of the java script navigation forms do not work with maximum number of web based email clients. It is a very important point to note that almost all the web based email browsers are FORMS themselves and always make use of Java script in some way or the other. Therefore, it is very important that the script is always safe so that it doesn’t really interfere with any of their products.

These days Flash has been greatly used in the emails for actually impressing the clients, news letter subscribers or for that matter the prospects. As a matter of fact email HTML browsers are just no in no way equal to their web browsers. The complexity is further increased because of the settings, versions, preferences, third party applications and the security settings. Always remember to avoid the use of flash as far as possible in your HTML email unless and until you are absolutely sure that the email client that is being used by your recipient client is actually capable of handling the Flash content. Further, you should only think of sending the Flash content only to those clients who have actually requested for it or with whom you have certain marketing relationship.

And in case you have no other option but to send the Flash content via email then there are certain important considerations to be made in order to avoid any kind of problems. Firstly one should never try controlling the Flash content by making use of active scripting. Secondly, it is very important that one should try and consider the option of sending links. It has been most commonly seen that the majority of the web based clients are actually capable of stripping the flash content. Therefore it is always better to attach or a send a link instead of actually including the content in the email itself. This way you can have the option of playing around with a lot of limitations that are imposed b y the browsers and the email clients. And last but not the least always ensure that your files should be controlled by a trigger, an onClick or any other event but should not immediately start playing. The main reason for this is to give the user or the recipient time to open to the flash content whenever ready instead of a surprise and thereby causing unnecessary problems.