Invalid email address

Hi there,

I have trying to add a new member to the membership list, the email will not be accepted and I get the following message:

You have errors in your form below. Please scroll down and correct the following:
1. Invalid/Non-functioning E-mail: crystal@sfab.co.nz (No advertised SMTP servers are accepting mail.)

I have sent emails individually and it has worked each time

Regards
Diane

They host their email in a datacenter that allows hackers who tried to hack FTH and that IP was blocked.
I have removed the block for their email server.