Missing MX-record

Information:
The domain (part after at-symbol) in the sender emailaddress has no MX-record or forward-reverse DNS match.

Solution:
Sending domain needs MX (not an RFC1918 adresse / local ip)
or
Connecting IP must have matching forward/reverse DNS.

Important: The sender emailaddress must be able to accept bounces else it might be blocked again.

Questions:
Questions regarding this error message can be sent to postmaster@abuse.mail.dk (remember to include the error message, ip-address being blocked and your question).