A Good Email Address that I received a stop notice for from FTH

I am with Gavel Masters Toastmasters club #3614062 in San Antonio, TX.
I have a member who has an AOL account (for a very loooong time!) and has been receiving emails from our FTH server for at least 4 years (and I believe still is).  However, I received a notice in my FTH admin messages that her email was no longer valid and emails would no longer be delivered from FTH.

I have read the "Ensuring that members receive email" notice in the support page and it does not cover this situation nor is there any contact info provided...

Please advise (puckett50j@gmail.com) as I do not want my member to miss any Gavel Masters Toastmasters FTH communications.  My member's name is Betty Puckett and her current and still active/working email address is:  bettypuck@aol.com

Thank you,
Jeff