In the example above you see a routing table which should be needed to deleted. When you click to delete this routing table you might getting the following error.
Click on oke. close the Mailmarshal configurator.
start > Run > type regedit and click on OK.
Look for the following registry key:
(NOTE Default could be without the (1))
You see here the wrong routing table registry key.
Make sure you have a backup of the register. And delete the wrong key. Which gave the first given error/warning.
Now you see that the wrong routing table is gone.
Note restart the MailMarshal Engine afterwards this one will stop.