diff --git a/Dockerfile b/Dockerfile
index 16e3055..29675ab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,6 +3,7 @@ FROM alpine
 RUN apk add --no-cache \
     ca-certificates \
     curl \
+    mailx \
     nagios \
     nagios-plugins \
     nagios-plugins-dig \