In this case Im really not sure.
Do you want to send an email directly or trigger the application to open a blank email for a user to then fill in and send?
The later can be done as you would in html
To have flex send an email directly though you need to connect to an email server
Is this a flex web app or a flex air app?
If it’s a web app you could add a small amount of PHP of coldFusion code depending on your hosting and write a small script that flex would then call to trigger the email sending
Let me know and I will try to help if at all possible
Sorry to not have simpler answer for you
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