[Bug 4716] New: no ipv6 PTR record for bz.selenic.com (?)

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4716

          Priority: normal
            Bug ID: 4716
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: no ipv6 PTR record for bz.selenic.com (?)
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: av6 at dwimlabs.net
          Hardware: PC
            Status: UNCONFIRMED
           Version: default branch
         Component: website
           Product: Mercurial

When bugzilla tried to email me using ipv6, email bounced:

NOQUEUE: reject: RCPT from unknown[2600:3c01::f03c:91ff:feae:7be1]: 550 5.7.1
Client host rejected: cannot find your reverse hostname,
[2600:3c01::f03c:91ff:feae:7be1]; from=<mercurial-bugs at selenic.com>
to=<av6 at dwimlabs.net> proto=ESMTP helo=<bz.selenic.com>

Indeed, it doesn't resolve to anything:

$ dig @8.8.8.8 -x 2600:3c01::f03c:91ff:feae:7be1

; <<>> DiG 9.9.5-9-Debian <<>> @8.8.8.8 -x 2600:3c01::f03c:91ff:feae:7be1
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 14464
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;1.e.b.7.e.a.e.f.f.f.1.9.c.3.0.f.0.0.0.0.0.0.0.0.1.0.c.3.0.0.6.2.ip6.arpa. IN
PTR

;; AUTHORITY SECTION:
1.0.c.3.0.0.6.2.ip6.arpa. 1799    IN    SOA    ns1.linode.com. dns.linode.com.
2015060814 14400 14400 1209600 86400

;; Query time: 124 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Jun 09 00:00:37 IRKT 2015
;; MSG SIZE  rcvd: 155


Now, the client checks on my end could be too strict, but I still don't think
it's unreasonable to expect a good mailer to have a valid PTR record.

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