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NTMail VRFY Vulnerability

Solution:
In NTMail 5 VRFY can be turned off properly.

For NTMail 4.x:
There is another way to turn off VRFY besides the normal GUI interface. From a post to Bugtraq by NTMail Support:

To switch of the VRFY command, select "Support > System Variables" and choose the "AllowVRFY" variable from the drop-down. Set this to the value 0 and press "Change Value". You will now see the response: 558 VRFY not allowed.