mail.coza.net.za has no MX records.
Question and response
Question
dig mail.coza.net.za. MX
Answer
The response has no answer records.
Authority
coza.net.za. 30 SOA beth.coza.net.za. support.dns.net.za. 2026010716 86400 3600 1814400 30
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0