code: private Collection<MailFolder> listMailboxes(GreenMailUser user,
                                       String mailboxPattern,
                                       boolean subscribedOnly)
              throws FolderException {
          List<MailFolder> mailboxes = new ArrayList<>();
          String qualifiedPattern = getQualifiedMailboxName(user, mailboxPattern);
  
          for (MailFolder folder : store.listMailboxes(qualifiedPattern)) {
              // TODO check subscriptions.
              if (subscribedOnly && !subscriptions.isSubscribed(user, folder)) {
                  // if not subscribed
                  folder = null;
              }
  
              // Sets the store to null if it's not viewable.
              folder = checkViewable(folder);
  
              if (folder != null) {
                  mailboxes.add(folder);
              }
          }
  
          return mailboxes;
      }
docs: Partial implementation of list functionality.
  TODO: Handle wildcards anywhere in store pattern
  (currently only supported as last character of pattern)
  
  @see com.icegreen.greenmail.imap.ImapHostManager#listMailboxes