secondary.webserversystems.com has no MX records.
Question and response
Question
dig secondary.webserversystems.com. MX
Answer
The response has no answer records.
Authority
webserversystems.com. 3600 SOA primary.webserversystems.com. support.webserversystems.com. 2023092218 3600 3600 604800 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0