diff --git a/smtprelay/Dockerfile b/smtprelay/Dockerfile
index 20797fb..a7fe7f5 100644
--- a/smtprelay/Dockerfile
+++ b/smtprelay/Dockerfile
@@ -1,13 +1,17 @@
 FROM alpine
-RUN apk --update --no-cache add shadow opensmtpd opensmtpd-filter-dkimsign && \
-    install -dm 711 /var/spool/smtpd && \
-    groupmod -g 601 smtpd && \
-    groupmod -g 602 smtpq && \
-    groupmod -g 603 dkimsign && \
-    usermod -u 601 -g smtpd smtpd && \
-    usermod -u 602 -g smtpq smtpq && \
-    usermod -u 603 -g dkimsign dkimsign && \
-    chgrp smtpq /usr/sbin/smtpctl && \
-    chmod g+s /usr/sbin/smtpctl && \
+RUN set -eux; \
+    apk --update --no-cache add shadow opensmtpd opensmtpd-filter-dkimsign; \
+    install -dm 711 /var/spool/smtpd; \
+    groupmod -g 601 smtpd; \
+    groupmod -g 602 smtpq; \
+    groupmod -g 603 dkimsign; \
+    usermod -u 601 -g smtpd smtpd; \
+    usermod -u 602 -g smtpq smtpq; \
+    usermod -u 603 -g dkimsign dkimsign; \
+    chgrp smtpq /usr/sbin/smtpctl; \
+    chmod g+s /usr/sbin/smtpctl; \
     apk del shadow
-ENTRYPOINT ["smtpd", "-d"]
+EXPOSE 25
+EXPOSE 465
+EXPOSE 587
+CMD ["smtpd", "-d"]
diff --git a/smtprelay/docker-compose.yml b/smtprelay/docker-compose.yml
index c63c004..f13b58b 100644
--- a/smtprelay/docker-compose.yml
+++ b/smtprelay/docker-compose.yml
@@ -10,4 +10,5 @@ services:
       - ./opensmtpd:/etc/smtpd:ro
       - spool:/var/spool/smtpd
     ports:
+      - 465:465
       - 587:587
diff --git a/smtprelay/opensmtpd/smtpd.conf b/smtprelay/opensmtpd/smtpd.conf
index 1574043..b8053fe 100644
--- a/smtprelay/opensmtpd/smtpd.conf
+++ b/smtprelay/opensmtpd/smtpd.conf
@@ -5,6 +5,7 @@ table creds file:/etc/smtpd/creds
 
 filter "dkimsign" proc-exec "filter-dkimsign -d abzw.de -d codehal.de -s lok01 -k /etc/smtpd/dkim_rsa4096.key" user dkimsign group dkimsign
 
+listen on eth0 port 465 smtps pki smtprelay.abzw.de auth <creds>
 listen on eth0 port 587 tls-require pki smtprelay.abzw.de auth <creds>
 listen on 127.0.0.1 port 10027 tag DKIM_SIGNED filter "dkimsign"