mail.rconnects.com has no MX records.
Question and response
Question
dig mail.rconnects.com. MX
Answer
The response has no answer records.
Authority
rconnects.com. 60 SOA ns1.systemdns.com. hostmaster.systemdns.com. 1770417085 10800 3600 1209600 60
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0