s3adm: remove mail tool

Dockerfile.s3adm

@@ -5,7 +5,7 @@ ENV LC_ALL=C.UTF-8
 ENV LANG=C.UTF-8
 
 # Add System Tools
-RUN apk add --update --no-cache curl jq git openssl unzip gettext bash pwgen grep heirloom-mailx bind-tools busybox-extras mysql-client && apk upgrade
+RUN apk add --update --no-cache curl jq git openssl unzip gettext bash pwgen grep bind-tools busybox-extras mysql-client && apk upgrade
 # Add s3cmd
 RUN apk add --no-cache py-pip && pip install s3cmd
 # Add kubectl