diff --git a/Dockerfile b/Dockerfile
index c986683..d096360 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,9 @@ MAINTAINER Juan Luis Baptiste juan.baptiste@gmail.com
 
 RUN yum install -y epel-release && yum update -y && \
     yum install -y cyrus-sasl cyrus-sasl-plain cyrus-sasl-md5 mailx \
-    perl supervisor postfix rsyslog
+    perl supervisor postfix rsyslog \
+    && rm -rf /var/cache/yum/* \
+    && yum clean all
 RUN sed -i -e "s/^nodaemon=false/nodaemon=true/" /etc/supervisord.conf
 RUN sed -i -e 's/inet_interfaces = localhost/inet_interfaces = all/g' /etc/postfix/main.cf