sjc.sonic.net has no MX records.
Question and response
Question
dig sjc.sonic.net. MX
Answer
The response has no answer records.
Authority
sjc.sonic.net. 3600 SOA ns1.sonic.net. hostmaster.sonic.net. 2026022502 3600 300 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0