zimbra-out.quanza.net has no MX records.
Question and response
Question
dig zimbra-out.quanza.net. MX
Answer
The response has no answer records.
Authority
quanza.net. 3600 SOA ns1.quanza.net. hostmaster.quanza.net. 2026030503 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0