ns19092188168.a2dns.com has no MX records.
Question and response
Question
dig ns19092188168.a2dns.com. MX
Answer
The response has no answer records.
Authority
a2dns.com. 86400 SOA ns0090.secondary.cloudflare.com. sys.a2hosting.com. 2341945130 14400 7200 1814400 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0