smtp6.agroweb.nl has no MX records.
Question and response
Question
dig smtp6.agroweb.nl. MX
Answer
The response has no answer records.
Authority
agroweb.nl. 86400 SOA ns1.agroweb.nl. postmaster.agroweb.nl. 2025060200 28800 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0