Have you asked them to setup PTR records?

We usually do it for our clients, so I’ve no idea how others handle it

--

Mr Michele Neylon

Blacknight Solutions

Hosting, Colocation & Domains

https://www.blacknight.com/

https://blacknight.blog/

Intl. +353 (0) 59  9183072

Direct Dial: +353 (0)59 9183090

Personal blog: https://michele.blog/

Some thoughts: https://ceo.hosting/

-------------------------------

Blacknight Internet Solutions Ltd, Unit 12A,Barrowside Business Park,Sleaty Road,Graiguecullen,Carlow,R93 X265,Ireland  Company No.: 370845

I have sent this email at a time that is convenient for me. I do not expect you to respond to it outside of your usual working hours.

From: anti-abuse-wg <anti-abuse-wg-bounces@ripe.net> on behalf of Alessandro Vesely <vesely@tana.it>
Date: Friday, 5 April 2024 at 13:01
To: anti-abuse-wg <anti-abuse-wg@ripe.net>
Subject: [anti-abuse-wg] Reverse DNS delegations

[EXTERNAL EMAIL] Please use caution when opening attachments from unrecognised sources.

Hi all,

what's the policy for reverse delegation?  My provider assigned me a 2a02:29e1:500:6c00::/56.  Great.  However they didn't delegate reverse DNS.  Indeed, their own 2a02:29e1::/32 has no delegations:

; <<>> DiG 9.18.24-1-Debian <<>> 1.e.9.2.2.0.a.2.ip6.arpa ns
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 19800
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: cad8ae482b0e559c01000000660fe49763aa815e05fda159 (good)
;; QUESTION SECTION:
;1.e.9.2.2.0.a.2.ip6.arpa.      IN      NS

;; AUTHORITY SECTION:
0.a.2.ip6.arpa.         3600    IN      SOA     pri.authdns.ripe.net. dns.ripe.net. 1712314758 3600 600 864000 3600


Now there are mail servers which reject mail if they don't find a matching PTR:

  <<< 554 resimta-c2p-559421.sys.comcast.net resimta-c2p-559421.sys.comcast.net 2a02:29e1:500:6c00::4 Comcast requires that all mail servers must have a PTR record with a valid Reverse DNS entry. Currently your mail server does not fill that requirement. For more information, refer to: https://postmaster.comcast.net/smtp-error-codes.php#554


Why isn't it possible to gain a delegation by proving number assignment?


Best
Ale
--








--

To unsubscribe from this mailing list, get a password reminder, or change your subscription options, please visit: https://lists.ripe.net/mailman/listinfo/anti-abuse-wg