mail.warwickicsystems.com has no CNAME records.
Question and response
Question
dig mail.warwickicsystems.com. NS
Answer
The response has no answer records.
Authority
warwickicsystems.com. 3041 SOA nsa1.civicahosting.co.uk. richard\.ward.civica.co.uk. 2026020400 10800 3600 604800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0