Contact Form Plugin how to send to different recipients based on country selected?
I'm not sure this is going to be possible with the current version (1.8.1) of Contact Form.

The only thing passed into the beforeSend event is the message, so it doesn't really give you a chance to modify other properties of the email.

Maybe you could pull it off by dynamically adding these addresses with some JavaScript that checked selected countries and added to post, but those values are expected to be |hashed.

You could always just fork the plugin and modify it for your specific needs, too.