Hi Tobi

The records were deleted around 10.01.2020. If you could tell me which domains are still pointing to this records, that would be helpful. I'll contact you offlist as soon as I have more information.

Kind Regards Stephan

On 07/02/2020 10.45, Tobi wrote:

Hi

hope someone from Swisscom reads here. We're currently seeing that DNS A records for MX hosts of several domains disappeared. They all using

...

mtainXX.mailsecurity.swisscom.com

as MX record. But there are no A records for those MX

; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc31 <<>> mtain01.mailsecurity.swisscom.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 47048 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;mtain01.mailsecurity.swisscom.com. IN A

;; AUTHORITY SECTION: swisscom.com. 574 IN SOA dns3.swisscom.com. admin.dns.swisscom.com. 42532 21600 3600 604800 600

;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fr Feb 07 10:42:03 CET 2020 ;; MSG SIZE rcvd: 113

; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc31 <<>> mtain02.mailsecurity.swisscom.com ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56271 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 512 ;; QUESTION SECTION: ;mtain02.mailsecurity.swisscom.com. IN A

;; AUTHORITY SECTION: swisscom.com. 574 IN SOA dns3.swisscom.com. admin.dns.swisscom.com. 42532 21600 3600 604800 600

;; Query time: 0 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Fr Feb 07 10:42:03 CET 2020 ;; MSG SIZE rcvd: 113

According to our passive DNS data there are at least 63 domains using one of these hosts as their MX.

--

Cheers

tobi

---

swinog mailing list swinog@lists.swinog.ch http://lists.swinog.ch/cgi-bin/mailman/listinfo/swinog

Hi All

Just to give you an update on what happened here: - the old platform has been removed/migrated last fall; the A record has been removed in january - all active customers and domains have been migrated - we have no customer complaints - there are some customers, which haven't updated their DNS after several reminders (I suppose these are customers which decided not to continue with the service) - the technical people checked their config and are not missing any entries

-> so in short: customer / domain owner problem not Swisscom.

Wish you a nice weekend, -steven

-----Ursprüngliche Nachricht----- Von: swinog-bounces@lists.swinog.ch im Auftrag von Daniel Stirnimann daniel.stirnimann@switch.ch Datum: Freitag, 7. Februar 2020 um 11:47 An: "swinog@swinog.ch" swinog@swinog.ch Betreff: Re: [swinog] Missing DNS A records for several domains hosted by swisscom.com

It looks like that the affected domain names have not been updated to the (new) MX hosts:

mx01.mailsecurity.swisscom.com. mx02.mailsecurity.swisscom.com.

So, I guess its a domain owner problem and not a Swisscom problem.

For example, spital-lachen.ch used to have mtainXX.mailsecurity.swisscom.com. until June 2019 and has since moved to mxXX.mailsecurity.swisscom.com.

Daniel

On 07.02.20 10:45, Tobi wrote: > Hi > > hope someone from Swisscom reads here. We're currently seeing that DNS A > records for MX hosts of several domains disappeared. They all using > >> mtainXX.mailsecurity.swisscom.com > > as MX record. But there are no A records for those MX > > > ; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc31 <<>> > mtain01.mailsecurity.swisscom.com > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 47048 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 > > ;; OPT PSEUDOSECTION: > ; EDNS: version: 0, flags:; udp: 512 > ;; QUESTION SECTION: > ;mtain01.mailsecurity.swisscom.com. IN A > > ;; AUTHORITY SECTION: > swisscom.com. 574 IN SOA dns3.swisscom.com. admin.dns.swisscom.com. > 42532 21600 3600 604800 600 > > ;; Query time: 0 msec > ;; SERVER: 127.0.0.1#53(127.0.0.1) > ;; WHEN: Fr Feb 07 10:42:03 CET 2020 > ;; MSG SIZE rcvd: 113 > > > ; <<>> DiG 9.11.14-RedHat-9.11.14-2.fc31 <<>> > mtain02.mailsecurity.swisscom.com > ;; global options: +cmd > ;; Got answer: > ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 56271 > ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1 > > ;; OPT PSEUDOSECTION: > ; EDNS: version: 0, flags:; udp: 512 > ;; QUESTION SECTION: > ;mtain02.mailsecurity.swisscom.com. IN A > > ;; AUTHORITY SECTION: > swisscom.com. 574 IN SOA dns3.swisscom.com. admin.dns.swisscom.com. > 42532 21600 3600 604800 600 > > ;; Query time: 0 msec > ;; SERVER: 127.0.0.1#53(127.0.0.1) > ;; WHEN: Fr Feb 07 10:42:03 CET 2020 > ;; MSG SIZE rcvd: 113 > > > According to our passive DNS data there are at least 63 domains using > one of these hosts as their MX. > > -- > > Cheers > > tobi

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