smtp.uhaul.com has no MX records.
Question and response
Question
dig smtp.uhaul.com. MX
Answer
The response has no answer records.
Authority
uhaul.com. 300 SOA dns1.cscdns.net. hostmaster.cscdns.net. 200003855 10800 7200 1209600 300
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0