e.ci-servers.net has no MX records.
Question and response
Question
dig e.ci-servers.net. MX
Answer
The response has no answer records.
Authority
ci-servers.net. 300 SOA ns1.rapidswitch.com. hostmaster.channelisles.net. 2022021101 7200 900 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0