smtp1.connectalk.com has no MX records.
Question and response
Question
dig smtp1.connectalk.com. MX
Answer
The response has no answer records.
Authority
connectalk.com. 3600 SOA ns.ctalk.com. support.connectalk.com. 2026022001 1200 180 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0