From 9c7093f674f416e766668c23c8400662d5434786 Mon Sep 17 00:00:00 2001
From: manuel <manuel@mausz.at>
Date: Tue, 11 Jun 2019 15:46:55 +0200
Subject: Add max recipients limit

---
 qmail-smtpd.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/qmail-smtpd.c b/qmail-smtpd.c
index 38c5929..839f2d3 100644
--- a/qmail-smtpd.c
+++ b/qmail-smtpd.c
@@ -53,6 +53,8 @@ unsigned int mfchk = 0;
 unsigned int greetdelay = 0;
 unsigned int drop_pre_greet = 0;
 int timeout = 1200;
+int recipcount = 0;
+unsigned int max_recipcount = 100;
 
 const char *protocol = "SMTP";
 
@@ -312,6 +314,9 @@ void setup()
   x = env_get("DROP_PRE_GREET");
   if (x) { scan_ulong(x, &u); drop_pre_greet = u; }
 
+  x = env_get("MAXRCPT");
+  if (x) { scan_ulong(x,&u); max_recipcount = u; }
+
   remoteip = env_get("TCPREMOTEIP");
   if (!remoteip) remoteip = "unknown";
   local = env_get("TCPLOCALHOST");
@@ -539,7 +544,6 @@ stralloc mailfrom = {0};
 stralloc rcptto = {0};
 stralloc fuser = {0};
 stralloc mfparms = {0};
-int recipcount;
 
 int mailfrom_size(arg) char *arg;
 {
@@ -731,6 +735,11 @@ void smtp_rcpt(arg) char *arg; {
   if (!seenmail) { err_wantmail(); return; }
   if (!addrparse(arg)) { err_syntax(); return; }
   if (!relayclient && addrrelay()) { err_relay(); return; }
+  if (recipcount >= max_recipcount) {
+    out("450 4.7.1 Error: too many recipients\r\n");
+    strerr_warn2("qmail-smtpd: too many recipients at ",remoteip,0);
+    return;
+  }
   if (flagbarfbhelo) {
     if (logregex) {
       strerr_warn6("qmail-smtpd: badhelo: <",helohost.s,"> at ",remoteip," matches pattern: ",matchedregex.s,0);
-- 
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