mail1235c.emails.boxtops4education.com has no MX records.
Question and response
Question
dig mail1235c.emails.boxtops4education.com. MX
Answer
The response has no answer records.
Authority
boxtops4education.com. 900 SOA mgoextdns1.genmills.com. dom\.admin.genmills.com. 910 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0