[dns-operations] Cannot send mail to outlook.com due to olc.protection.outlook.com configuration issues

[John Levine]

It appears that Craig Leres <leres at ee.lbl.gov> said:
>I've had edns0 in resolv.conf for a really long time but even if I 
>comment that out I'm still unable to deliver mail. Also I get SERVFAIL 
>or a timeout if I lookup outlook-com.olc.protection.outlook.com.

I run the FreeBSD package of unbound and it has no trouble even when I
specifically set an edns0 option.  What else might be odd about your
setup?

$ drill -b 2000 outlook-com.olc.protection.outlook.com. a
;; ->>HEADER<<- opcode: QUERY, rcode: NOERROR, id: 9650
;; flags: qr rd ra ; QUERY: 1, ANSWER: 7, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;; outlook-com.olc.protection.outlook.com.	IN	A

;; ANSWER SECTION:
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.8.37
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.8.35
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.68.4
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.73.29
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.11.6
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.11.5
outlook-com.olc.protection.outlook.com.	300	IN	A	52.101.68.37

;; AUTHORITY SECTION:

;; ADDITIONAL SECTION:

;; Query time: 183 msec
;; EDNS: version 0; flags: ; udp: 1232
;; SERVER: fde3:783e:127d:1::2
;; WHEN: Fri Oct  6 21:35:19 2023
;; MSG SIZE  rcvd: 179