[Mailman-Users] Response: 450 Host down

Martin Hugo Martin_Hugo at hboe.org
Wed Dec 29 15:47:12 CET 2010

Hi Joni,

Sounds like your incoming mail server for your Mailman System is either not reachable or not responding to your outgoing server when you send the message.  You don't mention if they are separate systems or domains so I can't make any other suggestions at this time.  I would try opening a command prompt on your sending system and trying to manually contact the SMTP server on your Mailman System by telnetting to your Mailman SMTP server on port 25 and sending a message that way.  This may give you more information.


-----Original Message-----
From: mailman-users-bounces+martin_hugo=hboe.org at python.org [mailto:mailman-users-bounces+martin_hugo=hboe.org at python.org] On Behalf Of Joni Seth
Sent: Wednesday, December 29, 2010 8:16 AM
To: mailman-users at python.org
Subject: [Mailman-Users] Response: 450 Host down

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.

Eastern Center for Arts and Technology

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