TIdMailBoxAttributes is an enumerated type that specifies the valid values for flags that can be associated with a TIdMailbox object instance. TIdMailBoxAttributes is the type used for the TIdMailbox.Attributes property, and can contain the following:
maNoinferiors - The mailbox does not allow either creation or access for child levels in the mailbox hierarchy.
maNoselect - The mailbox is a child in the mailbox hierarchy that cannot be selected.
maMarked - The maibox has been marked as "interesting" by the server, and probably contains messages that have been added since the last time the maibox was selected.
maUnmarked - The mailbox does not contain any messages added since the last time the maibox was selected.