cluster.entregaemail.com has no SRV records.
Question and response
Question
dig cluster.entregaemail.com. SRV
Answer
The response has no answer records.
Authority
entregaemail.com. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2396297192 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0