Looking for someone who handles mail in duke.edu for a sub-delegation. I
am having problems with mail delays on @dm.duke.edu due to DNS lookup
failures causing domain does not exist errors.
2024-09-18T10:22:33.457792-07:00 mail postfix/smtpd[4184837]: NOQUEUE:
reject: RCPT from unknown[2600:1806:511:210:1eaf::11]: 450 4.1.8
<duhs_ehr-form-requ...@dm.duke.edu>: Sender address rejected: Domain not
found; from=<duhs_ehr-form-requ...@dm.duke.edu> to=<xxxx...@xxxxxx.com>
proto=ESMTP helo=<mx1.dnsmadeeasy.com>
2024-09-18T10:22:34.095199-07:00 mail2 postfix/smtpd[2623717]: NOQUEUE:
reject: RCPT from unknown[2600:1806:511:210:1eaf::11]: 450 4.1.8
<duhs_ehr-form-requ...@dm.duke.edu>: Sender address rejected: Domain not
found; from=<duhs_ehr-form-requ...@dm.duke.edu> to=<xxxx...@xxxxxxx.com>
proto=ESMTP helo=<mx1.dnsmadeeasy.com>
2024-09-18T10:22:35.175737-07:00 mail2 postfix/smtpd[2623717]: NOQUEUE:
reject: RCPT from unknown[2600:1806:511:210:1eaf::11]: 450 4.1.8
<duhs_ehr-form-requ...@dm.duke.edu>: Sender address rejected: Domain not
found; from=<duhs_ehr-form-requ...@dm.duke.edu> to=<xxxx...@xxxxxxx.com>
proto=ESMTP helo=<mx1.dnsmadeeasy.com>
Looking at DNS shows me the following (and DNSViz):
dm.duke.edu. 21600 IN NS nameserver1.mc.duke.edu.
dm.duke.edu. 21600 IN NS nameserver2.mc.duke.edu.
;; Received 135 bytes from 152.3.105.232#53(dns-auth-02.oit.duke.edu) in
76 ms
nameserver1.mc.duke.edu has address 152.16.1.4
nameserver1.mc.duke.edu has IPv6 address 2620:0:691:dc50::4
nameserver2.mc.duke.edu has address 152.16.1.12
nameserver2.mc.duke.edu has IPv6 address 2620:0:691:dc57::12
Works on IPv4:
; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @152.16.1.4
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4622
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 12 ("..")
;; QUESTION SECTION:
;dm.duke.edu. IN MX
;; ANSWER SECTION:
dm.duke.edu. 3600 IN MX 10 mx.oit.duke.edu.
;; AUTHORITY SECTION:
dm.duke.edu. 86400 IN NS nameserver1.mc.duke.edu.
dm.duke.edu. 86400 IN NS nameserver2.mc.duke.edu.
;; Query time: 77 msec
;; SERVER: 152.16.1.4#53(152.16.1.4)
;; WHEN: Thu Sep 19 06:37:13 PDT 2024
;; MSG SIZE rcvd: 140
; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @152.16.1.12
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 7136
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 1
;; WARNING: recursion requested but not available
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; OPT=15: 00 12 ("..")
;; QUESTION SECTION:
;dm.duke.edu. IN MX
;; ANSWER SECTION:
dm.duke.edu. 3600 IN MX 10 mx.oit.duke.edu.
;; AUTHORITY SECTION:
dm.duke.edu. 86400 IN NS nameserver2.mc.duke.edu.
dm.duke.edu. 86400 IN NS nameserver1.mc.duke.edu.
;; Query time: 76 msec
;; SERVER: 152.16.1.12#53(152.16.1.12)
;; WHEN: Thu Sep 19 09:57:48 PDT 2024
;; MSG SIZE rcvd: 140
Fails on IPv6:
; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @2620:0:691:dc50::4
;; global options: +cmd
;; connection timed out; no servers could be reached
; <<>> DiG 9.10.3-P4-Debian <<>> MX dm.duke.edu @2620:0:691:dc57::12
;; global options: +cmd
;; connection timed out; no servers could be reached
~Seth
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