Re: [exim] MX name with _ : all relevant MX records point t…

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Autor: W B Hacker
Datum:  
To: exim users
Betreff: Re: [exim] MX name with _ : all relevant MX records point tonon-existent hosts
mbneto wrote:
> Hi,
>
> Some clever admin configured the MX of a domain pointing to
> server_01.domain.com.
>
> My users are unable to send email to that domain and attempts to contact the
> admin and tell him that _ is not allowed resulted in 'every body else
> works'.
>
> So, is there any workaround this issue?
>
> Regards.


domain.com shows up with two A RR's:

;; ANSWER SECTION:
domain.com.             3492    IN      A       66.150.120.131
domain.com.             3492    IN      A       216.34.94.184
conducive# dig any mx domain.com



The MX is on 66.150.120.140

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 0

;; QUESTION SECTION:
;domain.com.                    IN      MX


;; ANSWER SECTION:
domain.com.             3600  IN   MX      10 sentry.domainbank.com.


;; AUTHORITY SECTION:
domain.com.             60      IN      NS      ns1.dotsterhost.com.
domain.com.             60      IN      NS      ns3.dotsterhost.com.
domain.com.             60      IN      NS      ns2.dotsterhost.com.


;; Query time: 187 msec
;; SERVER: 202.85.128.32#53(202.85.128.32)
;; WHEN: Wed Apr 22 21:11:42 2009
;; MSG SIZE rcvd: 128

Suggest you simply Locally Blacklist it bothway.

End of problem.

Bill