mailserver.myorderbox.com has no SRV records.
Question and response
Question
dig mailserver.myorderbox.com. SRV
Answer
The response has no answer records.
Authority
myorderbox.com. 1800 SOA andy.ns.cloudflare.com. dns.cloudflare.com. 2398024541 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0