Message Not Delivered notice for a member for club email from club's FTH website

Club #650660,  www.prospeakerclub.com .  Club email and agendas being generated by the Toastmaster of the meeting to the club from our club's FTH website are not being delivered to one of our members.  His email address is correct in the memberships roster on the admin side (ttabraham@gmail.com).  It works from member's private one to one home emails to him and he replies back, but not for emails being sent to the club when generated on FTH.   
The "Message Not Delivered" notice "From lindymaclaine@gmail.com Mon Nov 20 20:11:07 2023"... for ; Mon, 20 Nov 2023 20:11:06 GMT" showing "To: members@prospeakerclub.com, thomas t abraham ", which he did not receive.  His email address is correctly listed in FTH membership. This is what she received from FTH:
From: FreeToastHost Server <This email address is being protected from spambots. You need JavaScript enabled to view it.>
Date: Mon, Nov 20, 2023 at 12:12 PM
Subject: [FreeToastHost] Message Not Delivered: Your invitation to our holiday festivity Dec. 21, including your sign-up sheet link
thomastabraham@outlook appears to be an invalid or non-working recipient email address. (No advertised SMTP servers are accepting mail.)
 *** Please check the email address to make sure it is not misspelled. ***
If you believe this warning is incorrect, please visit support.toastmastersclubs.org and post a support request message.

Please see the attachment of the lengthy script that came with the Message Not Delivered.   
Thank you for your assistance,
S. Kolb, Club #560660,  www.prospeakerclub.com . 

Your member Thomas has an invalid secondary email address.  I suspect that the message either relates to that address or the bad address is affecting all of his email.  Please ask him to correct the secondary address (it is missing the '.com' portion at the end )

Thank you, Pam, for your help. I have notified Thomas about your recommendation. I appreciate your help!
Sandra