mxmta.bellnet.ca has no MX records.
Question and response
Question
dig mxmta.bellnet.ca. MX
Answer
The response has no answer records.
Authority
bellnet.ca. 900 SOA mtl02vnszs08.srvr.bell.ca. dns-admin.bellglobal.com. 7994 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0