--- qmail-smtpd.c.orig	Mon Jun 15 19:53:16 1998
+++ qmail-smtpd.c	Fri Mar 22 14:17:12 2002
@@ -248,6 +248,12 @@
   out("250 ok\r\n");
 }
 void smtp_rcpt(arg) char *arg; {
+#if 1 /*REJECT_PERCENT[*/
+  { char *at = arg + str_chr(arg, '@');
+    if ((*at++ && at[str_chr(at, '@')]) ||
+       arg[str_chr(arg, '%')] ||
+       arg[str_chr(arg, '!')]) { err_nogateway(); return; } }
+#endif /*]*/
   if (!seenmail) { err_wantmail(); return; }
   if (!addrparse(arg)) { err_syntax(); return; }
   if (flagbarf) { err_bmf(); return; }