# apply this in the qpopper3.0b20/popper/ directory with patch < qp3b20.patch
--- pop_msg.c.old	Mon Nov 29 23:42:03 1999
+++ pop_msg.c	Mon Nov 29 23:52:08 1999
@@ -65,7 +65,7 @@
     /*  Append the message (formatted, if necessary) */
     if (format) {
 #ifdef HAVE_VPRINTF
-        vsprintf(mp,format,ap);
+        vsnprintf(mp,MAXLINELEN - 100, format,ap);
 #else
 # ifdef PYRAMID
 	arg1 = va_arg(ap, char *);
@@ -74,9 +74,9 @@
 	arg4 = va_arg(ap, char *);
 	arg5 = va_arg(ap, char *);
 	arg6 = va_arg(ap, char *);
-        (void)sprintf(mp,format, arg1, arg2, arg3, arg4, arg5, arg6);
+        (void)sprintf(mp,MAXLINELEN - 100, format, arg1, arg2, arg3, arg4, arg5, arg6);
 # else
-        (void)sprintf(mp,format,((int *)ap)[0],((int *)ap)[1],((int *)ap)[2],
+        (void)sprintf(mp,MAXLINELEN - 100, format,((int *)ap)[0],((int *)ap)[1],((int *)ap)[2],
 		      ((int *)ap)[3],((int *)ap)[4]);
 # endif
 #endif