bounces001.icpbounce.com has no MX records.
Question and response
Question
dig bounces001.icpbounce.com. MX
Answer
The response has no answer records.
Authority
icpbounce.com. 1800 SOA gail.ns.cloudflare.com. dns.cloudflare.com. 2396237247 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0