spf-sb.et.namecheap.tech has no MX records.
Question and response
Question
dig spf-sb.et.namecheap.tech. MX
Answer
The response has no answer records.
Authority
et.namecheap.tech. 86400 SOA edns.registrar-servers.com. support.namecheap.com. 1770988369 86400 7200 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0