geoinside.1and1.org has no MX records.
Question and response
Question
dig geoinside.1and1.org. MX
Answer
The response has no answer records.
Authority
1and1.org. 600 SOA ns-1and1.ui-dns.org. dnsadmin.ionos.com. 2013083827 10800 3600 604800 600
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0