/email duplication

I am facing big problem with this plugin on my website iafrica.tv.
it is making duplication for each post. for example:
http://www.iafrica.tv/lira-ready-to-perform-at-obamas-inauguration-2/
it will create duplicate
http://www.iafrica.tv/lira-ready-to-perform-at-obamas-inauguration-2/email

like this every post have /email at the end.

I have try to remove this plugin but it also not removing. tell me. what will i do.

http://wordpress.org/extend/plugins/wp-email/