Utilise les images officielles mariadb, php et nginx

devphp7/smtp/Dockerfile

@@ -0,0 +1,8 @@
+FROM debian:jessie 
+RUN echo "deb http://debian.mirrors.ovh.net/debian/ jessie-backports main" >> /etc/apt/sources.list \
+    && apt-get update && apt-get install -y \
+        opensmtpd/jessie-backports \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+ENTRYPOINT ["/usr/sbin/smtpd", "-d"]