hosting.namecheap.net has no MX records.
Question and response
Question
dig hosting.namecheap.net. MX
Answer
The response has no answer records.
Authority
hosting.namecheap.net. 3600 SOA edns.registrar-servers.com. support.namecheap.com. 1771931883 3600 1801 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0