MX and SMTP Servers for juno.com are blocked because of untd.com block in molinero.dev and pgl.yoyo.org

[rkrenzis]

Emails cannot be sent to @juno.com because molinero.dev and pgl.yoyo.org contain the domain untd.com.

❯ find . -type f -name list.txt -exec grep -il ^untd.com {} ;
./molinero.dev/list.txt
./pgl.yoyo.org/list.txt

MX records for juno.com:

❯ dig -t mx juno.com

; <<>> DiG 9.10.6 <<>> -4 -t mx juno.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14451
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1460
;; QUESTION SECTION:
;juno.com. IN MX

;; ANSWER SECTION:
juno.com. 567 IN MX 10 mx.dca.untd.com.
juno.com. 567 IN MX 10 mx.vgs.untd.com.

;; Query time: 9 msec
;; SERVER: 10.0.50.8#53(10.0.50.8)
;; WHEN: Sun Nov 09 15:12:36 EST 2025
;; MSG SIZE rcvd: 88

SMTP maillog (postfix helo_check fails because it cannot validate EHLO/HELO and fails the email delivery with temporary 450 to try again later):

Oct 28 15:53:31 mx0 postfix/smtpd[22922]: NOQUEUE: reject: RCPT from unknown[64.136.47.37]: 450 4.7.1 <outbound-mail03.dca.untd.com>: Helo command rejected: Host not found; from=<__REDACTED__@juno.com> to=<__REDACTED__> proto=ESMTP helo=<outbound-mail03.dca.untd.com>