CNAME for MX Record?

bsfinkel at anl.gov bsfinkel at anl.gov
Wed Aug 19 18:05:11 UTC 2009


Bradley Caricofe wrote:
>> Hey list,
>>
>> I have the following issue. A customer hosts a domain with me,
>> facplus.com. Her primary email account is on that domain, we'll call
>> it her at facplus.com. She has also registered another name through
>> Dotster, meetingtoolsandjewels.com. Dotster provides her with URL
>> redirection and email forwarding for that domain. She has setup an
>> email address, we'll call it her at meetingtoolsandjewels.com, which
>> should forward to her at facplus.com.
>>
>> We've been having a problem where not all senders are being received
>> when mail is sent to the her at meetingtoolsandjewels.com account. I've
>> sent her test emails from gmail, yahoo and my own server (sendmail)
>> and all were received. When I send emails from systems using exchange,
>> I eventually get a bounce that the message has been delayed...it's
>> never received.
>>
>> When I do digs for the MX record for meetingtoolsandjewels.com I get a CNAME:
>>
>> [root at jump1 ~]# dig meetingtoolsandjewels.com MX
>>
>> ; <<>> DiG 9.3.4-P1 <<>> meetingtoolsandjewels.com MX
>> ;; global options:  printcmd
>> ;; Got answer:
>> ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 5373
>> ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0
>>
>> ;; QUESTION SECTION:
>> ;meetingtoolsandjewels.com.     IN      MX
>>
>> ;; ANSWER SECTION:
>> meetingtoolsandjewels.com. 3600 IN      CNAME   meetingsmaven.typepad.com.
>>
>> ;; AUTHORITY SECTION:
>> typepad.com.            600     IN      SOA     ns1.sixapart.com.
>> hostmaster.sixapart.com. 2009051400 10800 3600 604800 600
>>
>> ;; Query time: 233 msec
>> ;; SERVER: 192.168.75.1#53(192.168.75.1)
>> ;; WHEN: Wed Aug 19 04:44:21 2009
>> ;; MSG SIZE  rcvd: 139
>>
>> ---
>>
>> If I do digs against her actual nameservers, I get a correct MX
>> record. What the heck am I seeing here and is this the likely cause of
>> the delayed emails?


and Kevin Darcy replied:

>What I see is:
>
>meetingtoolsandjewels.com/MX resolves to m1.dnsix.com with preference 0.
>
>meetingsmaven.typepad.com/MX doesn't resolve at all from typepad.com's 
>nameservers, but meetingsmaven.typepad.com/A does.
>
>Maybe it was just a poorly-executed migration?
>
>                                                                         
>         - Kevin


What I see is this:

dns% dig meetingtoolsandjewels.com. mx

; <<>> DiG 8.3 <<>> meetingtoolsandjewels.com. mx 
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;;      meetingtoolsandjewels.com, type = MX, class = IN

;; ANSWER SECTION:
meetingtoolsandjewels.com.  30M IN MX  0 m1.dnsix.com.

;; AUTHORITY SECTION:
meetingtoolsandjewels.com.  1D IN NS  ns2.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns4.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns1.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns3.nameresolve.com.

;; ADDITIONAL SECTION:
ns1.nameresolve.com.    1d6h16m1s IN A  64.94.117.199
ns2.nameresolve.com.    1d6h16m1s IN A  63.251.83.88
ns3.nameresolve.com.    1d6h16m1s IN A  66.150.161.151
ns4.nameresolve.com.    1d6h16m1s IN A  64.94.31.66

;; Total query time: 192 msec
;; FROM: dns.anl.gov to SERVER: default -- 146.139.254.3
;; WHEN: Wed Aug 19 12:53:37 2009
;; MSG SIZE  sent: 43  rcvd: 216

dns% dig meetingtoolsandjewels.com. mx @ns3.nameresolve.com

; <<>> DiG 8.3 <<>> meetingtoolsandjewels.com. mx @ns3.nameresolve.com 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;;      meetingtoolsandjewels.com, type = MX, class = IN

;; ANSWER SECTION:
meetingtoolsandjewels.com.  30M IN MX  0 m1.dnsix.com.
meetingtoolsandjewels.com.  1H IN CNAME  meetingsmaven.typepad.com.

;; AUTHORITY SECTION:
meetingtoolsandjewels.com.  1D IN NS  ns1.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns2.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns3.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns4.nameresolve.com.

;; ADDITIONAL SECTION:
ns1.nameresolve.com.    1D IN A         64.94.117.199
ns2.nameresolve.com.    1D IN A         63.251.83.88
ns3.nameresolve.com.    1D IN A         66.150.161.151
ns4.nameresolve.com.    1D IN A         64.94.31.66

;; Total query time: 62 msec
;; FROM: dns.anl.gov to SERVER: ns3.nameresolve.com  66.150.161.151
;; WHEN: Wed Aug 19 12:54:10 2009
;; MSG SIZE  sent: 43  rcvd: 252

dns% dig meetingtoolsandjewels.com soa @ns3.nameresolve.com.

; <<>> DiG 8.3 <<>> meetingtoolsandjewels.com soa @ns3.nameresolve.com. 
; (1 server found)
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
;; flags: qr aa rd; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 4
;; QUERY SECTION:
;;      meetingtoolsandjewels.com, type = SOA, class = IN

;; ANSWER SECTION:
meetingtoolsandjewels.com.  1D IN SOA  ns1.nameresolve.com. hostmaster.meetingtoolsandjewels.com. (
                                        2009081908      ; serial
                                        4h33m4s         ; refresh
                                        34m8s           ; retry
                                        1w5d3h16m16s    ; expiry
                                        42m40s )                ; minimum

meetingtoolsandjewels.com.  1H IN CNAME  meetingsmaven.typepad.com.

;; AUTHORITY SECTION:
meetingtoolsandjewels.com.  1D IN NS  ns1.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns2.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns3.nameresolve.com.
meetingtoolsandjewels.com.  1D IN NS  ns4.nameresolve.com.

;; ADDITIONAL SECTION:
ns1.nameresolve.com.    1D IN A         64.94.117.199
ns2.nameresolve.com.    1D IN A         63.251.83.88
ns3.nameresolve.com.    1D IN A         66.150.161.151
ns4.nameresolve.com.    1D IN A         64.94.31.66

;; Total query time: 63 msec
;; FROM: dns.anl.gov to SERVER: ns3.nameresolve.com.  66.150.161.151
;; WHEN: Wed Aug 19 13:03:12 2009
;; MSG SIZE  sent: 43  rcvd: 274
dns% 

How can

     meetingtoolsandjewels.com

have an SOA and a CNAME?  Does this violate the "CNAME and other"
restriction?
----------------------------------------------------------------------
Barry S. Finkel
Computing and Information Systems Division
Argonne National Laboratory          Phone:    +1 (630) 252-7277
9700 South Cass Avenue               Facsimile:+1 (630) 252-4601
Building 222, Room D209              Internet: BSFinkel at anl.gov
Argonne, IL   60439-4828             IBMMAIL:  I1004994



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