ip-184-164-199-199.KRYPTCOLO.NET has no MX records.
Question and response
Question
dig ip-184-164-199-199.KRYPTCOLO.NET. MX
Answer
The response has no answer records.
Authority
NET. 900 SOA a.gtld-servers.NET. nstld.verisign-grs.com. 1772086411 1800 900 604800 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0