I have set up Mailman and Postfix, following the instructions to the letter, and although Mailman will send out email fine, when I, as the administrator, try to send my email to the list I have created, I get the following error: Response: 450 Host down (myserver.mydomain.org). I am quite new to this and am not a Mailman or Postfix expert by any means, but if someone could point me in the right direction, I would be very grateful. Thank you.
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