diff -ur mutt-1.1.9-orig/hdrline.c mutt-1.1.9/hdrline.c
--- mutt-1.1.9-orig/hdrline.c	Fri Mar  3 04:10:08 2000
+++ mutt-1.1.9/hdrline.c	Thu Mar 23 02:56:36 2000
@@ -216,6 +216,7 @@
  * %T = $to_chars
  * %u = user (login) name of author
  * %v = first name of author, unless from self
+ * %y = X-Label: head, or nothing
  * %Z = status flags	*/
 
 struct hdr_format_info
@@ -607,6 +608,21 @@
       if ((p = strpbrk (buf2, " %@")))
 	*p = 0;
       snprintf (dest, destlen, fmt, buf2);
+      break;
+
+    case 'y':
+      if (optional)
+      {
+	optional = hdr->env->label ? 1 : 0;
+	break;
+      }
+      snprintf (fmt, sizeof (fmt), "%%%ss", prefix);
+      if (hdr->env->label)
+      {
+	if (flags & M_FORMAT_TREE && hdr->tree)
+	  break;
+	snprintf (dest, destlen, fmt, NONULL (hdr->env->label));
+      }
       break;
 
     case 'Z':
diff -ur mutt-1.1.9-orig/mutt.h mutt-1.1.9/mutt.h
--- mutt-1.1.9-orig/mutt.h	Fri Mar  3 04:10:10 2000
+++ mutt-1.1.9/mutt.h	Thu Mar 23 02:30:08 2000
@@ -458,6 +458,7 @@
   char *message_id;
   char *supersedes;
   char *date;
+  char *label;
   LIST *references;		/* message references (in reverse order) */
   LIST *userhdrs;		/* user defined headers */
 } ENVELOPE;
diff -ur mutt-1.1.9-orig/parse.c mutt-1.1.9/parse.c
--- mutt-1.1.9-orig/parse.c	Tue Mar  7 18:06:47 2000
+++ mutt-1.1.9/parse.c	Thu Mar 23 02:19:42 2000
@@ -1185,6 +1185,11 @@
 	  }
 	  matched = 1;
 	}
+	else if (mutt_strcasecmp (line+1, "-label") == 0)
+	{
+	  e->label = safe_strdup(p);
+	  matched = 1;
+	}
 	    
       default:
 	break;