regn.net has no MX records.
Question and response
Question
dig regn.net. MX
Answer
The response has no answer records.
Authority
regn.net. 900 SOA ns1.reedelsevier.com. hostmaster.lexisnexis.com. 661 3600 900 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0