What are some factors when considering servers?

By default, Flickr uses the least restrictive Creative Commons license.

Answer the following statement true (T) or false (F)

A form of commercial advertising that the receiver of the email has not requested. It can fill email inboxes with unwanted messages. The user can implement a __ filter to filter these types of emails to a special folder.

Fill in the blank(s) with the appropriate word(s).