Conversations, messages that can be viewed in groups, can be expanded or collapsed

A mail ____________________ or mailing list is a list of e-mail addresses stored under a unique title.

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

A function that does not alter a linked list, but looks at the list to determine if it is empty, is referred to as a ________ function.

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