connect.aciglobal.com has no MX records.
Question and response
Question
dig alenco.crowdfiber.com. MX
Answer
The response has no answer records.
Authority
crowdfiber.com. 1800 SOA ada.ns.cloudflare.com. dns.cloudflare.com. 2396865619 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0