Is it possible to create a formatted e-mail using the Send Email button in an activity?

My users would like to be able to send an e-mail with specific content (format) when they click on the "Send Email" button in the activity screen.

Since there are different type of activities, the format should be triggered based on the subject or activity type.

Does anyone know if this is at all possible within CRMOD?

And, if so, is there any documentation that I can use to set this up?

Thanks in advance for your time,

Ruud.