Member emails not delivered

Emails to a member of our club are not delivered
This email address has been registered for years in our club website and has always worked fine
I can send and receive emails from the member with no problems

I  got this message from FreeToastHost Server

This email address is being protected from spambots. You need JavaScript enabled to view it. 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. ***

Club 6275  Lehigh Valley Creative Communicators

Thanks
Ari Valero

Someone within his server IP block has attacked the FTH server using a wordpress hack and the Ip range was blocked.

I have removed the block for now but it can happen again if the server is attacked.

Thanks for your quick reply
I'll let the member know the reason for being blocked

Regards
Ari Valero