This is a greylisting patch for qmail that i (Anton Lundin, glance@acc.umu.se)
have put togeader by taking some code from patches that is prox the same and 
combined them to a single one i like.

this is made to work whith the qmail-envelope-scanner-postgrey and
qmail-envelope-scanner-mysql.



diff -ur netqmail-1.05.toaster-0.8.1+greylist+customreject/qmail-smtpd.c netqmail-1.05.toaster-0.8.1+greylist-mysql+customreject/qmail-smtpd.c
--- netqmail-1.05.toaster-0.8.1+greylist+customreject/qmail-smtpd.c	2006-01-12 22:20:08.000000000 +0100
+++ ./qmail-smtpd.c	2006-01-12 22:53:53.000000000 +0100
@@ -30,6 +30,8 @@
 #include "env.h"
 #include "now.h"
 #include "exit.h"
+#include "fork.h"
+#include "wait.h"
 #include "rcpthosts.h"
 #include "timeoutread.h"
 #include "timeoutwrite.h"
@@ -94,6 +96,8 @@
 void die_ipme() { out("421 unable to figure out my IP addresses (#4.3.0)\r\n"); flush(); _exit(1); }
 void straynewline() { out("451 See http://pobox.com/~djb/docs/smtplf.html.\r\n"); flush(); _exit(1); }
 
+void err_tempfail() { out("450 temporary envelope failure (#4.3.0)\r\n"); }
+void err_permfail() { out("550 sorry, permanent envelope failure (#5.7.1)\r\n"); }
 void err_size() { out("552 sorry, that message size exceeds my databytes limit (#5.3.4)\r\n"); }
 void err_bmf() { out("553 sorry, your envelope sender has been denied (#5.7.1)\r\n"); }
 void err_bmt() { out("553 sorry, your envelope recipient has been denied (#5.7.1)\r\n"); }
@@ -461,6 +465,37 @@
     }
 }
 
+int envelope_scanner()
+{
+  int child;
+  int wstat;
+  char *envelope_scannerarg[] = { env_get("ENVELOPE_SCANNER") , mailfrom.s, addr.s, 0 };
+
+  switch(child = vfork()) {
+    case -1:
+      return 1;
+    case 0:
+      execv(*envelope_scannerarg,envelope_scannerarg);
+      _exit(111);
+  }
+
+  wait_pid(&wstat,child);
+  if (wait_crashed(wstat)) {
+    return 1;
+  }
+
+  switch(wait_exitcode(wstat)) {
+    case 101:
+      err_tempfail();
+      return 0;
+    case 100:
+      err_permfail();
+      return 0;
+    default:
+      return 1;
+  }
+}
+
 void smtp_helo(arg) char *arg;
 {
   smtp_greet("250 "); out("\r\n");
@@ -608,6 +643,9 @@
     if (!stralloc_0(&addr)) die_nomem();
                 break;
   }
+  if (!relayclient) {
+    if (env_get("ENVELOPE_SCANNER") && !envelope_scanner()) return;
+  }
   if (!stralloc_cats(&rcptto,"T")) die_nomem();
   if (!stralloc_cats(&rcptto,addr.s)) die_nomem();
   if (!stralloc_0(&rcptto)) die_nomem();