Prospective email alerts are going to member who left the club

Oh.... so the prospective members were finding our club through toastmaster.org. I assumed it was through our club website. Okay, that makes sense. 

If you use a FTH provided address for your TI club contact address, it has the benefit of automatically getting routed to the proper people when you change officers.    

The only thing to keep in mind is do not use the members- or officers- FTH addresses there, those are blocked to anyone outside your club (like prospective members).  Instead, if you want to use a FTH address, use either the contact- address (& enable it in Email and Contact forms module) or an officer email address (e.g. vpm-)