JSI Tip 4677. Nslookup 'Can't find address for server TYPE=MX: Non-existent domain'?

When using NSLookUp, you receive a message similar to:

*** Can't find address for server TYPE=MX: Non-existent domain.

NOTE: You may also be unable to exit NSLookUp.

This predicament is generally caused by the Caps Lock key being set.

NSlookup only accepts lower case commands.