diff --git a/lib/mu-msg-crypto.c b/lib/mu-msg-crypto.c
index 35002e2a..74fd8ede 100644
--- a/lib/mu-msg-crypto.c
+++ b/lib/mu-msg-crypto.c
@@ -293,6 +293,7 @@ mu_msg_mime_sig_infos (GMimeMultipartSigned *sigmpart, MuMsgOptions opts,
 }
 
 
+
 void
 mu_msg_part_free_sig_infos (GSList *siginfos)
 {
@@ -302,6 +303,46 @@ mu_msg_part_free_sig_infos (GSList *siginfos)
 }
 
 
+/*
+ * - if there's any signature with MU_MSG_PART_SIG_STATUS_(ERROR|FAIL),
+ *   the verdict is MU_MSG_PART_SIG_STATUS_ERROR
+ * - if not, if there's any signature with MU_MSG_PART_SIG_STATUS_BAD
+ *   the verdict is MU_MSG_PART_SIG_STATUS_BAD
+ * - if not, if there's any signature with MU_MSG_PART_SIG_STATUS_GOOD
+ *   the verdict is MU_MSG_PART_SIG_STATUS_GOOD
+ * - if not, the verdic is MU_MSG_PART_SIG_STATUS_UNKNOWN
+ */
+MuMsgPartSigStatus
+mu_msg_mime_sig_infos_verdict (GSList *sig_infos)
+{
+	GSList *cur;
+	MuMsgPartSigStatus status;
+
+	status = MU_MSG_PART_SIG_STATUS_UNKNOWN;
+
+	for (cur = sig_infos; cur; cur = g_slist_next (cur)) {
+		MuMsgPartSigInfo *siginfo;
+		siginfo = (MuMsgPartSigInfo*)cur->data;
+
+		/* if there's an error/failure, the verdict is error */
+		if (siginfo->status & MU_MSG_PART_SIG_STATUS_ERROR ||
+		    siginfo->status & MU_MSG_PART_SIG_STATUS_FAIL)
+			return MU_MSG_PART_SIG_STATUS_ERROR;
+
+		if (siginfo->status & MU_MSG_PART_SIG_STATUS_BAD)
+			status = MU_MSG_PART_SIG_STATUS_BAD;
+
+		if ((siginfo->status & MU_MSG_PART_SIG_STATUS_GOOD) &&
+		    status == MU_MSG_PART_SIG_STATUS_UNKNOWN)
+			status = MU_MSG_PART_SIG_STATUS_GOOD;
+	}
+
+	return status;
+}
+
+
+
+
 const char*
 mu_msg_part_sig_status_to_string (MuMsgPartSigStatus status)
 {
diff --git a/lib/mu-msg-crypto.h b/lib/mu-msg-crypto.h
index f1e73273..e9a6afc0 100644
--- a/lib/mu-msg-crypto.h
+++ b/lib/mu-msg-crypto.h
@@ -79,6 +79,24 @@ typedef struct _MuMsgPartSigInfo MuMsgPartSigInfo;
 const char* mu_msg_part_sig_status_to_string (MuMsgPartSigStatus status);
 
 
+/**
+ * summarize the signatures to one status:
+ *
+ * - if there's any signature with MU_MSG_PART_SIG_STATUS_(ERROR|FAIL),
+ *   the verdict is MU_MSG_PART_SIG_STATUS_ERROR
+ * - if not, if there's any signature with MU_MSG_PART_SIG_STATUS_BAD
+ *   the verdict is MU_MSG_PART_SIG_STATUS_BAD
+ * - if not, if there's any signature with MU_MSG_PART_SIG_STATUS_GOOD
+ *   the verdict is MU_MSG_PART_SIG_STATUS_GOOD
+ * - if not, the verdic is MU_MSG_PART_SIG_STATUS_UNKNOWN
+ *
+ * @param sig_infos
+ *
+ * @return the status
+ */
+MuMsgPartSigStatus mu_msg_mime_sig_infos_verdict (GSList *sig_infos);
+
+
 /**
  * convert the bitwise-OR'ed statuses to a string
  *
diff --git a/lib/mu-msg-sexp.c b/lib/mu-msg-sexp.c
index 5977a780..e252b88b 100644
--- a/lib/mu-msg-sexp.c
+++ b/lib/mu-msg-sexp.c
@@ -22,6 +22,7 @@
 #include "mu-msg.h"
 #include "mu-msg-iter.h"
 #include "mu-msg-part.h"
+#include "mu-msg-crypto.h"
 #include "mu-maildir.h"
 
 static void
@@ -238,6 +239,22 @@ elvis (const char *s1, const char *s2)
 	return s1 ? s1 : s2;
 }
 
+static const char*
+sig_verdict (GSList *sig_infos)
+{
+	switch (mu_msg_mime_sig_infos_verdict (sig_infos)) {
+	case MU_MSG_PART_SIG_STATUS_GOOD:
+		return ":signature good";
+	case MU_MSG_PART_SIG_STATUS_BAD:
+		return ":signature bad";
+	case MU_MSG_PART_SIG_STATUS_ERROR:
+		return ":signature error"; /* ugly */
+	default:
+		return "";
+	}
+}
+
+
 static void
 each_part (MuMsg *msg, MuMsgPart *part, PartInfo *pinfo)
 {
@@ -266,13 +283,14 @@ each_part (MuMsg *msg, MuMsgPart *part, PartInfo *pinfo)
 
 	tmp = g_strdup_printf
 		("%s(:index %d :name %s :mime-type \"%s/%s\"%s%s "
-		 ":attachment %s :size %i)",
+		 ":attachment %s :size %i %s)",
 		 elvis (pinfo->parts, ""), part->index, name,
 		 elvis (part->type, "application"),
 		 elvis (part->subtype, "octet-stream"),
 		 tmpfile ? " :temp" : "", tmpfile ? tmpfile : "",
 		 mu_msg_part_looks_like_attachment (part, TRUE) ? "t" : "nil",
-		 (int)part->size);
+		 (int)part->size,
+		 sig_verdict (part->sig_infos));
 
 	g_free (pinfo->parts);
 	pinfo->parts = tmp;