With rc2, the LIST command is returning both INBOX and INBOX.INBOX when using the following namespace setting...

namespace private { separator = . prefix = INBOX. inbox = yes location = maildir:%h:INDEX=/var/index/%h }

This patch fixed it for us:

*** src/imap/cmd-list.c 2006-07-05 11:14:58.000000000 -0400 --- src/imap/cmd-list.c.new 2006-07-05 11:15:45.000000000 -0400

*** 147,156 **** --- 147,159 ----

                    name = "INBOX";
                    ctx->inbox_found = TRUE;
            }

•             if (strcasecmp(list->name, "INBOX") == 0)

•                     continue;

•           str_truncate(str, 0);
            str_printfa(str, "* %s (%s) \"%s\" ",
                        ctx->lsub ? "LSUB" : "LIST",
                        mailbox_flags2str(list->flags, ctx->list_flags),
                        ctx->ns->sep_str);