mail3.2e2.com has no CNAME records.
Question and response
Question
dig mail3.2e2.com. NS
Answer
The response has no answer records.
Authority
2e2.com. 4626 SOA auth1.dns.gxn.net. hostmaster.daisygroup.com. 2025060513 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0