diff --git a/Dockerfile b/Dockerfile
index 75b6840..31c6c74 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,6 +71,7 @@ RUN postconf -e sender_canonical_maps=tcp:postsrsd:10001
 RUN postconf -e sender_canonical_classes=envelope_sender
 RUN postconf -e recipient_canonical_maps=tcp:postsrsd:10002
 RUN postconf -e recipient_canonical_classes=envelope_recipient,header_recipient
+RUN postconf -e smtpd_client_connection_rate_limit=10
 
 ARG ALPINE_VERSION=3.13.6
 ARG BASE_IMAGE=sutty/monit