n1.spambusters.email has no MX records.
Question and response
Question
dig n1.spambusters.email. MX
Answer
The response has no answer records.
Authority
spambusters.email. 86400 SOA ns1.webhs.org. reports.webhs.pt. 2025120800 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0