NEW FEATURE - Email Address Checker (in Membership Management)

We recently began receiving a Message Not Delivered email from FTH about one month ago. The message was associated with 3 email addresses. I forwarded the original message to each person individually from my Mac Mail email app. Each person confirmed receipt of the second email. It seems their addresses are real and functional.
I do not know what to do to resolve the issue when mailing from FTH. Can you help? I can forward the specific addresses to you by another means.

Sean Williams VPE Palmetto TM club 2070

Please provide the members first names and we can figure it out from there.