diff --git a/chatmaild/src/chatmaild/filtermail.py b/chatmaild/src/chatmaild/filtermail.py
index 66562569..b493bab8 100644
--- a/chatmaild/src/chatmaild/filtermail.py
+++ b/chatmaild/src/chatmaild/filtermail.py
@@ -149,7 +149,7 @@ class SendRateLimiter:
 def main():
     args = sys.argv[1:]
     assert len(args) == 1
-    logging.basicConfig(level=logging.INFO)
+    logging.basicConfig(level=logging.WARN)
     loop = asyncio.new_event_loop()
     asyncio.set_event_loop(loop)
     task = asyncmain_beforequeue(port=int(args[0]))
diff --git a/deploy-chatmail/src/deploy_chatmail/postfix/master.cf.j2 b/deploy-chatmail/src/deploy_chatmail/postfix/master.cf.j2
index ceae0d95..7c932c65 100644
--- a/deploy-chatmail/src/deploy_chatmail/postfix/master.cf.j2
+++ b/deploy-chatmail/src/deploy_chatmail/postfix/master.cf.j2
@@ -32,6 +32,7 @@ submission inet n       -       y       -       -       smtpd
   -o smtpd_recipient_restrictions=
   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
   -o milter_macro_daemon_name=ORIGINATING
+  -o smtpd_client_connection_count_limit=100
   -o smtpd_proxy_filter=127.0.0.1:10080
 smtps     inet  n       -       y       -       -       smtpd
   -o syslog_name=postfix/smtps
@@ -46,6 +47,7 @@ smtps     inet  n       -       y       -       -       smtpd
   -o smtpd_sender_restrictions=$mua_sender_restrictions
   -o smtpd_recipient_restrictions=
   -o smtpd_relay_restrictions=permit_sasl_authenticated,reject
+  -o smtpd_client_connection_count_limit=100
   -o milter_macro_daemon_name=ORIGINATING
   -o smtpd_proxy_filter=127.0.0.1:10080
 #628       inet  n       -       y       -       -       qmqpd