diff -urN qmail-1.03.orig/qmail-smtpd.c qmail-1.03-joejob/qmail-smtpd.c
--- qmail-1.03.orig/qmail-smtpd.c	Mon Jun 15 04:53:16 1998
+++ qmail-1.03-joejob/qmail-smtpd.c	Thu Jun  5 10:55:27 2003
@@ -200,6 +200,7 @@
 int bmfcheck()
 {
   int j;
+  if (!addr.len) return 1;
   if (!bmfok) return 0;
   if (constmap(&mapbmf,addr.s,addr.len - 1)) return 1;
   j = byte_rchr(addr.s,addr.len,'@');