rgw10.gigas.com has no MX records.
Question and response
Question
dig rgw10.gigas.com. MX
Answer
The response has no answer records.
Authority
gigas.com. 300 SOA ns01.gigas.com. hostmaster.gigas.com. 2026022402 1200 600 1209600 3600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0