www.ipacct.us has no MX records.
Question and response
Question
dig www.ipacct.us. MX
Answer
www.ipacct.us. 5 CNAME ipacct.us.
Authority
ipacct.us. 10800 SOA ns.ipacct.bg. noc.ipacct.com. 2025051601 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0