srr.dnsexit.com has no MX records.
Question and response
Question
dig srr.dnsexit.com. MX
Answer
The response has no answer records.
Authority
dnsexit.com. 1200 SOA ns1.dnsexit.com. admin.netdorm.com. 2000060701 86000 180000 1814400 1200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0