If SpamAssassin is enabled for user accounts, messages that have been judged to be spam by the processor can be delivered (with optional marking, configured in the SpamAssassin module), deleted, or delivered to a special folder named Spam within the users mail directory. While false positives are extremely rare with SpamAssassin in its default configuration, it may be wise to retain messages for some period of time and allow users to check the spam folder using Usermin webmail, or via IMAP folders (if IMAP is available to your users).