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
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