On Tue, Apr 15, 2025 at 02:54:33PM +0200,
 Alessandro Vesely <ves...@tana.it> wrote 
 a message of 46 lines which said:

> last night I sent 4 complaint messages to vodafone.com.  The first one 
> bounced like so:

Note that the name servers for mail.protection.outlook.com (the target
of the MX record) are quite broken, they return FORMERR for EDNS
questions. It may create problems.

% dig   @ns2-proddns.glbdns.protection.outlook.com.  
vodafone-com.mail.protection.outlook.com A          

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> 
@ns2-proddns.glbdns.protection.outlook.com. 
vodafone-com.mail.protection.outlook.com A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: FORMERR, id: 20571
;; flags: qr rd; QUERY: 0, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; WARNING: EDNS query returned status FORMERR - retry with '+noedns'

;; Query time: 12 msec
;; SERVER: 104.47.72.81#53(ns2-proddns.glbdns.protection.outlook.com.) (UDP)
;; WHEN: Tue Apr 15 15:53:29 CEST 2025
;; MSG SIZE  rcvd: 12


% dig +noedns  @ns2-proddns.glbdns.protection.outlook.com.  
vodafone-com.mail.protection.outlook.com A

; <<>> DiG 9.18.33-1~deb12u2-Debian <<>> +noedns 
@ns2-proddns.glbdns.protection.outlook.com. 
vodafone-com.mail.protection.outlook.com A
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57194
;; flags: qr aa rd; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;vodafone-com.mail.protection.outlook.com. IN A

;; ANSWER SECTION:
vodafone-com.mail.protection.outlook.com. 10 IN A 52.101.73.4
vodafone-com.mail.protection.outlook.com. 10 IN A 52.101.68.16
vodafone-com.mail.protection.outlook.com. 10 IN A 52.101.73.11
vodafone-com.mail.protection.outlook.com. 10 IN A 52.101.68.18

;; Query time: 16 msec
;; SERVER: 104.47.72.81#53(ns2-proddns.glbdns.protection.outlook.com.) (UDP)
;; WHEN: Tue Apr 15 15:53:34 CEST 2025
;; MSG SIZE  rcvd: 282
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