In other words, what is the meaning of blacklist, whitelist, legitimate,
etc.
Blacklist - a list of addresses, domains, or networks the messages from
which you wish to block no matter what the message contains.
Whitelist - a list of addresses, domains, or networks the messages from
which you wish to accept no matter what the message contains.
Legitimate - legal, correct, OK, acceptable.
Have you read the documentation that came with your GFI product (probably
GFI MailEssentials)? Have you consulted
http://www.gfi.com/ ?
