ia.rubypanel.com has no MX records.
Question and response
Question
dig ia.rubypanel.com. MX
Answer
The response has no answer records.
Authority
rubypanel.com. 300 SOA ruby.rubycom.com. abuserubycom.gmail.com. 2026021300 3600 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0