mail.metrompls.com has no MX records.
Question and response
Question
dig mail.metrompls.com. MX
Answer
The response has no answer records.
Authority
metrompls.com. 3600 SOA ns1.metrompls.com. hostmaster.metrompls.com. 2026010701 3600 900 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0