[Mailman-Users] Server skips Mailman - more II

Mark Sapiro mark at msapiro.net
Mon Dec 7 18:22:05 CET 2009

alexander at nautae.eti.br wrote:
>I'm not sure if it makes any difference, but... mailman should resolve  
>a subdomain.

Mailman is not a DNS server. It doesn't 'resolve' domains.

>I have a contact.enterprise.com subdomain.
>And I don't have any list.contact.enterprise.com.

Actually, even the name server at ns1.enterprise.com has no A or MX
records for either domain, contact.enterprise.com or

That raises the issue of how external mail even gets far enough to get
a "Recipient address rejected: User unknown in virtual mailbox table"

>I mean, Mailman should resolve directly the contact.enterprise.com
>I have a MX record in enterprise.com DNS server pointing to  

Not that I can see?

dig mx contact.enterprise.com @ns1.enterprise.com

; <<>> DiG 9.3.3rc2 <<>> mx contact.enterprise.com @ns1.enterprise.com
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 45783
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;contact.enterprise.com.                IN      MX

enterprise.com.         14400   IN      SOA     ns1.enterprise.com.
erprise.com. 2009111900 3600 1800 2592000 14400

;; Query time: 70 msec
;; WHEN: Mon Dec  7 09:11:

>And 'contact' machine is where the postfix/mailman is installed.
>I still stuck on "User unknown in virtual mailbox table".
>And I can't imagine why this error doesn't happen when I'm using an  
>account (even from another domain) hosted at the same  

If I send mail to local_address at lists.contact.enterprise.com, there
MUST be an MX or an A record in DNS for lists.contact.enterprise.com,
or my MTA doesn't know where to attempt to deliver that mail. It
doesn't 'fall back' to contact.enterprise.com or enterprise.com; it
just gives up. All this has to work before the message will even get
to the server that Mailman is running on.

If the Mailman/Postfix server is contact.enterprise.com, you need an A
record for contact.enterprise.com and an MX record for
lists.contact.enterprise.com giving contact.enterprise.com as the
target. Otherwise, the mail will never get to your server.
Alternatively, you can have just an A record for
lists.contact.enterprise.com giving the IP address of the server.

You don't appear to have any of these DNS records.

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

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