Does your mail server check DANE when sending email? (why?)
Send an email to these addresses (click to copy):
Or copy by hand:
Your mail server will probably keep trying to deliver mail it could not deliver immediately. You could receive several messages about this in the next few days. In particular, if you pass all three tests you will receive messages that your mail server could not reach wrong.havedane.net.
Check whether your mail server supports incoming DANE & STARTTLS at internet.nl.