mail2.upc.biz has no MX records.
Question and response
Question
dig mail2.upc.biz. MX
Answer
The response has no answer records.
Authority
upc.biz. 1 SOA ns1.upc.biz. domainadmin.libertyglobal.com. 2026022005 86400 7200 2592000 1
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0