[Mailman-Users] does not send emails

[Atlas]

List no longer sends emails, but archive is updated.  Need help.

using latest version and I am getting the following error in /var/log/mailman/smtp

Sep 25 19:00:03 2002 (11605) All recipients refused: host not found
Sep 25 19:00:03 2002 (11605) All recipients refused: host not found
Sep 25 19:00:03 2002 (11605) smtp for 18 recips, completed in 0.011 seconds
Sep 25 19:01:00 2002 (11619) All recipients refused: host not found
Sep 25 19:01:00 2002 (11619) All recipients refused: host not found
Sep 25 19:01:00 2002 (11619) smtp for 18 recips, completed in 0.012 seconds
Sep 25 19:02:00 2002 (11623) All recipients refused: host not found
Sep 25 19:02:00 2002 (11623) All recipients refused: host not found
Sep 25 19:02:00 2002 (11623) smtp for 18 recips, completed in 0.011 seconds    

and in smtp-failure
Sep 25 19:03:01 2002 (11663) -1 xxxx at somthing.com (ignore)
Sep 25 19:03:01 2002 (11663) -1 xxx (ignore)
Sep 25 19:03:01 2002 (11663) -1xxxx (ignore)
Sep 25 19:03:01 2002 (11663) -1 xxxxx (ignore)
Sep 25 19:03:01 2002 (11663) -1 xxxxx (ignore)
Sep 25 19:03:01 2002 (11663) -1 xxxxxx(ignore)
Sep 25 19:03:01 2002 (11663) -1 xxxxxx (ignore)                

and in post 

     Sep 25 19:04:01 2002 (11667) post to moonwalkers from xxxx at xxxx, size=906,18 failures
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