I do not know what is going on here:

This is found in the maillog on inet17

Nov  7 16:40:21 inet17 postfix/smtpd[79991]: NOQUEUE: reject: RCPT
from unknown[216.185.71.31]: 450 4.1.2
<r...@samba-01.brockley-2016.harte-lyne.ca>: Recipient address
rejected: Domain not found; from=<>
to=<r...@samba-01.brockley-2016.harte-lyne.ca> proto=ESMTP
helo=<mx31.harte-lyne.ca>

But this is what I get when I run dig on the same host a moment later:

[root@inet17 /var/spool/imap]# dig SAMBA-01.BROCKLEY-2016.HARTE-LYNE.CA

; <<>> DiG 9.12.1-P2 <<>> SAMBA-01.BROCKLEY-2016.HARTE-LYNE.CA
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 706
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;SAMBA-01.BROCKLEY-2016.HARTE-LYNE.CA. IN A

;; ANSWER SECTION:
SAMBA-01.BROCKLEY-2016.HARTE-LYNE.CA. 60 IN A   192.168.8.65

;; AUTHORITY SECTION:
BROCKLEY-2016.HARTE-LYNE.CA. 172800 IN  NS     
samba-02.BROCKLEY-2016.HARTE-LYNE.CA.
BROCKLEY-2016.HARTE-LYNE.CA. 172800 IN  NS     
samba-03.BROCKLEY-2016.HARTE-LYNE.CA.
BROCKLEY-2016.HARTE-LYNE.CA. 172800 IN  NS     
samba-04.BROCKLEY-2016.HARTE-LYNE.CA.
BROCKLEY-2016.HARTE-LYNE.CA. 172800 IN  NS     
samba-05.BROCKLEY-2016.HARTE-LYNE.CA.
BROCKLEY-2016.HARTE-LYNE.CA. 172800 IN  NS     
SAMBA-01.BROCKLEY-2016.HARTE-LYNE.CA.

;; Query time: 1 msec
;; SERVER: 216.185.71.33#53(216.185.71.33)
;; WHEN: Wed Nov 07 16:41:16 EST 2018
;; MSG SIZE  rcvd: 187

Why does dig find the domain while Postfix does not? I am guessing
that I have a misconfiguration somewhere but I cannot think of where.


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James B. Byrne                mailto:byrn...@harte-lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
9 Brockley Drive              vox: +1 905 561 1241
Hamilton, Ontario             fax: +1 905 561 0757
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