[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

Jacques Setton jsetton at waycast.com
Mon Apr 21 13:50:18 CEST 2014



After completely abandoning the use of a Plesk based Linux package (see
previous discussions
<https://www.mail-archive.com/mailman-users@python.org/msg63856.html> ), I
have been able to successfully deploy Mailman lists on a
Webmin/Postfix/Dovecot Linux package.


All mailman lists functions & features work well on the later system except
in one specific case. When I try to subscribe to a list (say ‘Mailman’)
using an e-mail address based on a virtual domain (say ‘domain.net’) which
is co-hosted with the default virtual domain used for Mailman lists (say
‘domain.org’), I immediately get an “Undelivered Mail Returned to Sender”
error as depicted below :



De : Jacques Setton [mailto:jsetton at domain.net] 

Envoyé : lundi 21 avril 2014 8:00

À : 'mailman-request at domain.org'

Objet : RE: confirm c36ad7639824b608c00b962a9afa76e2ccf006d1

De : MAILER-DAEMON (Mail Delivery System) [mailto:MAILER-DAEMON (Mail
Delivery System)] 

Envoyé : lundi 21 avril 2014 8:00

À : jsetton at domain.net

Objet : Undelivered Mail Returned to Sender

This is the mail system at host vps12345.ovh.net.

I'm sorry to have to inform you that your message could not be delivered to
one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own
text from the attached returned message.

                   The mail system

<mailman-request at domain.org>: user unknown

Attached error file details

Reporting-MTA: dns; vps12345.ovh.net

X-Postfix-Queue-ID: 9F72D11C00A

X-Postfix-Sender: rfc822; jsetton at domain.net

Arrival-Date: Mon, 21 Apr 2014 08:00:16 +0200 (CEST)

Final-Recipient: rfc822; mailman-request at domain.org

Original-Recipient: rfc822;mailman-request at domain.org

Action: failed      Status: 5.1.1

Diagnostic-Code: x-unix; user unknown



The 1st mail was sent to confirm the subscription to a list. The second mail
is the response received in return, indicating that the mailman specified
address was unknown. The attached error report follow thereafter.


The collocated virtual domains labeled ‘domain.org’ and ‘domain.net’ are
hosted on the same physical server ‘vps12345 at ovh.net’, sharing a common IP


Would such behavior be related to a bad or incomplete definition of the
‘mydestination’ / ‘myorigin’  parameters in the Postfix ‘main.cf’ file ? 


Here is an excerpt of the related values produced by the  ‘postconf –n’
command line : 



mydestination = localhost.$mydomain, localhost, localhost.localdomain

mydomain = localdomain

myhostname = vps12345.ovh.net

mynetworks =

myorigin = $mydomain


unknown_local_recipient_reject_code = 550




If not, what else could cause such failure ?


Thanks for any feedback / help on this issue


- - -

Jacques Setton

jsetton at waycast.com



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