smtprelay00.siteprotect.com has no MX records.
Question and response
Question
dig smtprelay00.siteprotect.com. MX
Answer
The response has no answer records.
Authority
siteprotect.com. 300 SOA a.dns.siteprotect.com. hostmaster.siteprotect.com. 2026022706 28800 7200 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0