On 9/25/17, Mail Delivery Subsystem <mailer-daemon@xxxxxxxxxxxxxx> wrote:
** Address not found **
Your message wasn't delivered to "Undisclosed-Recipient:,"@freelists.org
because the address couldn't be found. Check for typos or unnecessary spaces
and try again.
The response from the remote server was:
550 5.1.1 <Undisclosed-Recipient:,@freelists.org>: Recipient address
rejected: User unknown in local recipient table