Its been a while since I brought up a Cyrus system but it all comes back. Patch also attached.
--- cyrus-imapd-2.5.7/imap/imapd.c.orig 2016-05-22 19:42:22.960086891 +0000 +++ cyrus-imapd-2.5.7/imap/imapd.c 2016-05-22 19:43:31.482356696 +0000 @@ -11867,6 +11867,10 @@ prot_printf(backend_inbox->out, "%cchildren", c); c = ' '; } + if (listargs->ret & LIST_RET_SPECIALUSE) { + prot_printf(backend_inbox->out, "%cspecial-use", c); + c = ' '; + } (void)prot_putc(')', backend_inbox->out); }
imapd.c-patch1
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