aclmta01.oracle.com has no MX records.
Question and response
Question
dig aclmta01.oracle.com. MX
Answer
The response has no answer records.
Authority
oracle.com. 900 SOA ns1.p201.dns.oraclecloud.net. hostmaster.oracle.com. 2026022201 7200 600 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0