For something like that, you will still need to create an Action on the server, just like you did before. (The IO-204 still doesn't have the ability to send email directly.)
However, you may want to consider changing the say that data gets pushed to the ioBridge server. We will eventually remove all the "auto-message on input state change, analog trigger, etc" options from the IO-204. This is because the same features are available with the new On-board Rules. We need to remove that code from the firmware to make room for the next round of feature additions.