Slideshow: The Gmail already offers a lot of features, some of which can be activated through the Gmail Labs. However, some special needs require special tools. This is usually only options that meet a user niche.
There is then a plethora of extensions to boost Gmail. They are grafted on the browser. Only problem: not all are supported. Most often, these are available for Chrome and Firefox. These tools will secure message from beginning to end, sending his program in a few days, or turn this email task. Here is a partial selection.
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Gmail extension: Streak CRM
Gmail extension: Secure Streak
Gmail extension: docTrackr