diff --git a/Dockerfile b/Dockerfile
index 3be8719..c7443f2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -71,6 +71,9 @@ RUN apk --no-cache add \
 RUN addgroup -g 2222 dovecot
 RUN adduser -u 2222 -h /home/dovecot -D -G dovecot dovecot
 
+RUN addgroup -g 2222 dovenull
+RUN adduser -u 2222 -h /home/dovenull -D -G dovenull dovenull
+
 RUN addgroup -g 1111 vmail
 RUN adduser -u 1111 -h /var/lib/vmail -D -G vmail vmail