Email notifications to custom domain not delivered (possible hard bounce)

Support
2

There is no working email service for that domain. If I query for MX records I get the SOA record instead which DNS servers do when the request record does not exist:

$ dig nanoprotects.com MX

; <<>> DiG 9.20.8 <<>> nanoprotects.com MX
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 13943
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;nanoprotects.com.		IN	MX

;; AUTHORITY SECTION:
nanoprotects.com.	1800	IN	SOA	dns1.p01.nsone.net. domains+netlify.netlify.com. 1771149878 43200 7200 1209600 3600

;; Query time: 38 msec
;; SERVER: 8.8.8.8#53(8.8.8.8) (UDP)
;; WHEN: Mon Feb 16 13:44:16 PST 2026
;; MSG SIZE  rcvd: 123

No email is working for nanoprotects.com at all. You will need to get the email service configured for this domain.

Please see this sub-section of the following support guide for more instructions about how to resolve this:

I did not copy my records before switching name servers and my email (or other service) stopped working. How do I fix this?