I have installed "mpack" and used it successfully to send an attachment via email using the command line. Like this:

mpack -s "tool"  tooling.pdf user@email
I would like to be able to right click on a file, select "Send to", then select one from a list of about 6 recipients, have a pop-up to input subject, and that's it. The email is sent with the attachment.

Can anyone show me how to do this? I was trying to use the Nautilus-Actions Configuration Tool but it is too much for me.