Paragon has been receiving quite a number of emails kicked back due to an invalid email address. They have put into place a solution to help eliminate these kickbacks.
If an email is kicked out, the system will automatically “opt out” this email address. The agent who sent the email will receive an email from ParagonMessaging that this email address is opted out. You must enter a valid email address before emails can be sent. Before you contact your client, we recommend you check the spelling of the email address you entered into Paragon.
Your contacts can opt back in at: http://p100.paragonrels.com/paragonsubscriptions/optin.aspx