phaidra.smdaneb.com has no MX records.
Question and response
Question
dig phaidra.smdaneb.com. MX
Answer
The response has no answer records.
Authority
smdaneb.com. 1800 SOA lynn.ns.cloudflare.com. dns.cloudflare.com. 2396219053 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0