--- qmail-smtpd.c-ooo	Mon Jun 15 19:53:16 1998
+++ qmail-smtpd.c	Thu Dec  6 22:43:01 2001
@@ -51,6 +51,7 @@
 
 void err_bmf() { out("553 sorry, your envelope sender is in my badmailfrom list (#5.7.1)\r\n"); }
 void err_nogateway() { out("553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)\r\n"); }
+void err_srcrouting() { out("553 sorry, soure routing not allowed.\r\n"); }
 void err_unimpl() { out("502 unimplemented (#5.5.1)\r\n"); }
 void err_syntax() { out("555 syntax error (#5.5.4)\r\n"); }
 void err_wantmail() { out("503 MAIL first (#5.5.1)\r\n"); }
@@ -247,8 +248,25 @@
   if (!stralloc_0(&mailfrom)) die_nomem();
   out("250 ok\r\n");
 }
+int smtp_src_rtg (arg) char *arg;{
+  int r,l,c,p,b;
+  char* pt;
+  r = (int) str_rchr(arg,'@');
+  l = (int) str_len(arg);
+  c = (int) str_chr(arg,'@');
+  p = (int) str_chr(arg,'%');
+  b = (int) str_chr(arg,'!');
+  if (l != p ) return 0;   // % not totally allowed.
+  if (l != r &&  c != r )  return 0; // @ appears twice 
+  if (l != b ) return 0;   // bang ! not totally allowed.
+      //    pt = (char*)  strrchr(arg,'@');
+      //    *pt++ = '>';
+      //    *pt = 0;
+  return 1;
+}
 void smtp_rcpt(arg) char *arg; {
   if (!seenmail) { err_wantmail(); return; }
+  if (!smtp_src_rtg (arg)) { err_srcrouting() ;return;}
   if (!addrparse(arg)) { err_syntax(); return; }
   if (flagbarf) { err_bmf(); return; }
   if (relayclient) {