ns3.publicisgroupe.com has no MX records.
Question and response
Question
dig ns3.publicisgroupe.com. MX
Answer
The response has no answer records.
Authority
publicisgroupe.com. 900 SOA ns1.publicisgroupe.com. network.support.bcom3group.com. 2003023876 10800 3600 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0