relay03.LF.net has no MX records.
Question and response
Question
dig relay03.LF.net. MX
Answer
The response has no answer records.
Authority
lf.net. 3600 SOA dns1.lf.net. hostmaster.lf.net. 2026030901 86400 10800 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0