diff --git a/data/Dockerfiles/clamav/Dockerfile b/data/Dockerfiles/clamav/Dockerfile
index 26867111b..5ecde1c92 100755
--- a/data/Dockerfiles/clamav/Dockerfile
+++ b/data/Dockerfiles/clamav/Dockerfile
@@ -1,5 +1,5 @@
 FROM debian:stretch-slim
-MAINTAINER https://m-ko.de Markus Kosmal <code@cnfg.io>
+LABEL maintainer "https://m-ko.de Markus Kosmal <code@cnfg.io>"
 
 # Debian Base to use
 ENV DEBIAN_VERSION stretch
diff --git a/data/Dockerfiles/dovecot/Dockerfile b/data/Dockerfiles/dovecot/Dockerfile
index 0a357855e..a28b66284 100644
--- a/data/Dockerfiles/dovecot/Dockerfile
+++ b/data/Dockerfiles/dovecot/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:stretch-slim
 #ubuntu:xenial
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C
diff --git a/data/Dockerfiles/php-fpm/Dockerfile b/data/Dockerfiles/php-fpm/Dockerfile
index ad03b8ad4..0cee7e804 100644
--- a/data/Dockerfiles/php-fpm/Dockerfile
+++ b/data/Dockerfiles/php-fpm/Dockerfile
@@ -1,5 +1,5 @@
 FROM php:7.1-fpm
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 
diff --git a/data/Dockerfiles/postfix/Dockerfile b/data/Dockerfiles/postfix/Dockerfile
index 4616ba9ac..fbf8f10a2 100644
--- a/data/Dockerfiles/postfix/Dockerfile
+++ b/data/Dockerfiles/postfix/Dockerfile
@@ -1,5 +1,5 @@
 FROM debian:stretch-slim
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C
diff --git a/data/Dockerfiles/rmilter/Dockerfile b/data/Dockerfiles/rmilter/Dockerfile
index 1d5db5b0e..366f675d0 100644
--- a/data/Dockerfiles/rmilter/Dockerfile
+++ b/data/Dockerfiles/rmilter/Dockerfile
@@ -1,5 +1,5 @@
 FROM debian:jessie-slim
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C
diff --git a/data/Dockerfiles/rspamd/Dockerfile b/data/Dockerfiles/rspamd/Dockerfile
index 5adb9dce0..4d14c6f98 100644
--- a/data/Dockerfiles/rspamd/Dockerfile
+++ b/data/Dockerfiles/rspamd/Dockerfile
@@ -1,5 +1,5 @@
 FROM debian:jessie-slim
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C
diff --git a/data/Dockerfiles/sogo/Dockerfile b/data/Dockerfiles/sogo/Dockerfile
index b1b9d2499..8210ab82f 100644
--- a/data/Dockerfiles/sogo/Dockerfile
+++ b/data/Dockerfiles/sogo/Dockerfile
@@ -1,5 +1,5 @@
 FROM debian:jessie-slim
-MAINTAINER Andre Peters <andre.peters@servercow.de>
+LABEL maintainer "Andre Peters <andre.peters@servercow.de>"
 
 ENV DEBIAN_FRONTEND noninteractive
 ENV LC_ALL C