opssmtp.idibill.com has no MX records.
Question and response
Question
dig opssmtp.idibill.com. MX
Answer
The response has no answer records.
Authority
idibill.com. 86400 SOA edns1.ultradns.com. premiumdns.support.neustar. 2019073365 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0