mail1b.tilaa.nl has no MX records.
Question and response
Question
dig mail1b.tilaa.nl. MX
Answer
The response has no answer records.
Authority
tilaa.nl. 300 SOA ns1.tilaa.nl. hostmaster.tilaa.nl. 2025120104 43200 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0