Member Email Rejected on Club FTH Website - Please Fix

Our website is westshore227.toastmastersclubs.org/
Our club is West Shore Toastmasters #227

Recently the site started rejecting a member's email address, djlaw@pa.net, which is valid.  This email address works well with other sites.  I can send my fellow member emails from my email account just fine.

Here's the message I receive from FTH when I try to save the above email address as part of FTH Membership Management.
   You have errors in your form below. Please scroll down and correct the following:
   1. Invalid/Non-functioning E-mail: djlaw@pa.net (One Advertised SMTP server permanently refused mail.)

This rejection should not happen for an email address that works fine in every other context.

Thank you in advance for your help.
User name: Striver
 

Your members email provider is blocking FTH email server.
He will need to talk to them