add mailgun

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

mailgun/Dockerfile

@@ -0,0 +1,6 @@
+FROM r.j3ss.co/curl
+LABEL maintainer "Jessie Frazelle <jess@linux.com>"
+
+COPY sendmail /usr/bin/sendmail
+
+ENTRYPOINT [ "sendmail" ]

mailgun/sendmail

@@ -0,0 +1,41 @@
+#!/bin/bash
+set -e
+set -o pipefail
+
+if [[ -z "$MAILGUN_API_KEY" ]]; then
+	echo "Set the MAILGUN_API_KEY env variable."
+	exit 1
+fi
+
+if [[ -z "$MAILGUN_DOMAIN_NAME" ]]; then
+	echo "Set the MAILGUN_DOMAIN_NAME env variable."
+	exit 1
+fi
+
+if [[ -z "$TO_NAME" ]]; then
+	echo "Set the TO_NAME env variable."
+	exit 1
+fi
+
+if [[ -z "$TO_EMAIL" ]]; then
+	echo "Set the TO_EMAIL env variable."
+	exit 1
+fi
+
+if [[ -z "$SUBJECT" ]]; then
+	echo "Set the SUBJECT env variable."
+	exit 1
+fi
+
+if [[ -z "$BODY" ]]; then
+	echo "Set the BODY env variable."
+	exit 1
+fi
+
+curl -sSL --user "api:${MAILGUN_API_KEY}" \
+	"https://api.mailgun.net/v3/${MAILGUN_DOMAIN_NAME}/messages" \
+	-F "from='Excited User <mailgun@"${MAILGUN_DOMAIN_NAME}">'" \
+	-F "to=${TO_NAME}" \
+	-F "to=${TO_EMAIL}" \
+	-F "subject='"${SUBJECT}"'" \
+	-F "text='"${BODY}"'"