eu3smtp01.topdesk.net has no MX records.
Question and response
Question
dig eu3smtp01.topdesk.net. MX
Answer
The response has no answer records.
Authority
topdesk.net. 1800 SOA coby.ns.cloudflare.com. dns.cloudflare.com. 2398193700 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0