diff -urN cyrus-imapd-2.3.13.orig/imap/imapd.c cyrus-imapd-2.3.13/imap/imapd.c
--- cyrus-imapd-2.3.13.orig/imap/imapd.c	2008-11-15 23:40:36.000000000 +0100
+++ cyrus-imapd-2.3.13/imap/imapd.c	2008-11-26 11:22:03.000000000 +0100
@@ -987,7 +987,7 @@
     const char *err;
 
     prot_printf(imapd_out, "* OK [CAPABILITY ");
-    capa_response(CAPA_PREAUTH);
+    capa_response(CAPA_PREAUTH|CAPA_POSTAUTH);
     prot_printf(imapd_out, "]");
     if (config_serverinfo) prot_printf(imapd_out, " %s", config_servername);
     if (config_serverinfo == IMAP_ENUM_SERVERINFO_ON) {