Is JavaScript supported in an email message?

Question

Is JavaScript supported in an email message?

Answer 1

http://en.wikipedia.org/wiki/Comparison_of_e-mail_clients

Old clients, such as Lotus Notes, Mozilla Thunderbird, Outlook Express, and Windows Live Mail all seem to have supported some sort of JavaScript execution. Nothing else does.

It seems like a bad idea security-wise, so I would expect this to be a feature that won't always be around, even in these clients.