diff --git a/Dockerfile b/Dockerfile
index 40906ed..6d2a842 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,6 +20,16 @@ WORKDIR /tmp/${LIBRESSLVERSION}
 RUN ./configure --prefix=/usr/local/libressl --with-openssldir=/usr/local/libressl
 RUN make && make install
 
+WORKDIR /tmp
+RUN git clone -b portable git://github.com/OpenSMTPD/OpenSMTPD.git opensmtpd
+
+WORKDIR /tmp/opensmtpd
+RUN ./bootstrap \
+  && ./configure \
+  --with-libssl=/usr/local/libressl
+
+RUN make && make install
+
 # Override shell for bash-y debugging goodness
 SHELL ["/bin/bash", "-exc"]