[Mailman-Users] 'Undelivered Mail Returned to Sender' error when using an e-mail from a domain co-hosted with the one used for Mailman lists

[Mark Sapiro]

On 04/24/2014 02:56 PM, Jacques Setton wrote:
> 
> The complete output generated by the  '# postconf -n' command is appended
> below.
> Besides that, I have not configured postfix in any particular way...
> As previously indicated, Mailman works well with any external Email address,
> but not with the ones co-hosted on the same physical server...
> 
> Any idea about what the problem could be ?


Not until you do as I asked before and post the resulting output from
grepping the mail log for the Postfix queue id of a returned message.

Based on your prior post, this would be something like

grep 9F72D11C00A /var/log/maillog

Also it might help to see your transport maps - /etc/postfix/transport

-- 
Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan