diff --git a/dovecot/Dockerfile b/dovecot/Dockerfile
index fd0a3f8..fafa09b 100644
--- a/dovecot/Dockerfile
+++ b/dovecot/Dockerfile
@@ -1,9 +1,10 @@
-FROM debian:bookworm-slim
+FROM alpine:3.21
 
-RUN apt-get update && apt-get install -y dovecot-core dovecot-imapd
+RUN apk add --no-cache dovecot bash
 
 RUN mkdir -p /var/mail/vhosts && \
-    useradd -m -u 5000 -d /var/mail/vhosts vmail || true
+    addgroup -g 5000 vmail && \
+    adduser -D -u 5000 -G vmail -h /var/mail/vhosts vmail
 
 COPY ../share/users.txt /tmp/users.txt
 COPY ../share/dovecot.sh /tmp/dovecot.sh
diff --git a/postfix/Dockerfile b/postfix/Dockerfile
index c4c8a40..de50975 100644
--- a/postfix/Dockerfile
+++ b/postfix/Dockerfile
@@ -1,14 +1,13 @@
-FROM debian:bookworm-slim
+FROM alpine:3.21
 
-RUN apt-get update && apt-get install -y postfix mailutils
+RUN apk add --no-cache postfix bash
 
 COPY ../share/users.txt /tmp/users.txt
 COPY ../share/postfix.sh /tmp/postfix.sh
 COPY postfix/main.cf /etc/postfix/main.cf
 COPY postfix/entrypoint.sh /entrypoint.sh
 
-RUN chmod 644 /etc/postfix/main.cf && \
-    chmod +x /tmp/postfix.sh /entrypoint.sh && \
+RUN chmod +x /tmp/postfix.sh /entrypoint.sh && \
     /tmp/postfix.sh > /etc/postfix/virtual_mailbox && \
     postmap /etc/postfix/virtual_mailbox && \
     rm /tmp/users.txt /tmp/postfix.sh