On Fri, Jan 30, 2015 at 11:56:27AM -0500, James B. Byrne wrote:
> >> Jan 30 11:15:47 inet08 postfix-p25/smtpd[4796]: NOQUEUE: reject: RCPT
> >> from unknown[69.17.131.33]: 450 4.7.1 <mail4OA.4office.com>: Helo
> >> command rejected: Host not found; from=<[email protected]>
> >> to=<[email protected]> proto=ESMTP helo=<mail4OA.4office.com>
> >>
> >> 33.131.17.69.in-addr.arpa. 19371 IN PTR mail4oa.4office.com.
> >>
> >> The dig was run on the host rejecting the mail. Any ideas as to
> >> what is happening here? Am I missing something obvious?
> >
> > The helo hostname, mail4OA.4office.com, does not exist. You can
> > tell from the "helo command rejected: host not found" in the log.
Noel is absolutely right.
> And, as one can tell from the dig, mail4oa.4office.com. does exist.
NO. What the dig output shows is that a PTR record exists with
that name as the alleged holder of the address.
It completely fails to demonstrate the exitence of that host, which
DNS authoritatively says DOES NOT exist:
$ dig +noall +comment +ans +auth +qu +nocl +nottl -t a mail4oa.4office.com
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 59364
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;mail4oa.4office.com. IN A
;; AUTHORITY SECTION:
4office.com. SOA toroon63nszp04.srvr.bell.ca.
dns-admin.bellglobal.com. 8437 10800 3600 604800 1800
--
Viktor.
