smtpin2.smail.eu has no MX records.
Question and response
Question
dig smtpin2.smail.eu. MX
Answer
The response has no answer records.
Authority
smail.eu. 900 SOA ns1.dnspro.pt. support.sooma.com. 2025121555 1200 180 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0