seems to work

dovecot/Dockerfile

@@ -7,7 +7,7 @@ RUN apk add --no-cache \
 RUN sed -i 's/#!include auth-ldap.conf.ext/!include auth-ldap.conf.ext/' /etc/dovecot/conf.d/10-auth.conf \
     && sed -i 's/!include auth-passwdfile.conf.ext/#!include auth-passwdfile.conf.ext/' /etc/dovecot/conf.d/10-auth.conf \
     && sed -i 's/#first_valid_uid = .*/first_valid_uid = 100/g' /etc/dovecot/conf.d/10-mail.conf \
-    && sed -i 's/#last = .*/last = 100/g' /etc/dovecot/conf.d/10-mail.conf
+    && sed -i 's/#last_valid_uid = .*/last_valid_uid = 100/g' /etc/dovecot/conf.d/10-mail.conf
 
 RUN addgroup -S vmail \
     && adduser -S -g '' -H -D -h /var/vmail vmail vmail

dovecot/auth-ldap.conf.ext

@@ -1,6 +1,7 @@
 passdb {
   driver = ldap
   args = /etc/dovecot/dovecot-ldap.conf.ext
+  override_fields = user=%{auth_user}
 }
 
 userdb {

dovecot/entrypoint.sh

@@ -4,11 +4,7 @@ cat >> /etc/dovecot/dovecot-ldap.conf.ext << DOVECOTLDAP
 hosts = $LDAP_SERVER
 base = $LDAP_BASE
 auth_bind = yes
-user_filter = (&(objectClass=posixAccount)(mail=%u))
 pass_filter = (&(objectClass=posixAccount)(mail=%u))
-user_attrs = \
-           =home=/var/vmail/%d/%n, \
-           =mail=maildir:/var/vmail/%d/%n/Maildir
 DOVECOTLDAP
 
 cat > /etc/dovecot/conf.d/10-ssl.conf << SSL
@@ -19,9 +15,6 @@ ssl_key = <$TLS_KEY
 ssl_dh_parameters_length = 2048
 SSL
 
-# debugging
-#echo -e "auth_verbose=yes\nauth_debug=yes\nauth_debug_passwords=yes" >> /etc/dovecot/dovecot.conf
-
 [ -e /var/lib/dovecot/instances ] && rm -rf /var/lib/dovecot/instances
 
 exec dovecot -F

newaliases.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
-sudo chown root:root aliases
-docker-compose exec postfix postmap /etc/postfix/virtual
-sudo chown $USER:$USER aliases
+docker-compose exec postfix sh -c "
+chown root:root /etc/postfix/virtual;
+postmap /etc/postfix/virtual;
+chown $(id -u):$(id -g) /etc/postfix/virtual"

postfix/Dockerfile

@@ -43,8 +43,6 @@ RUN echo '' > /etc/postfix/main.cf \
     && postconf -e strict_rfc821_envelopes='yes' \
     && echo 'MAILER-DAEMON: postmaster\npostmaster: root' > /etc/postfix/aliases
 
-#    && postconf -e virtual_mailbox_maps='ldap:/etc/postfix/ldap/mailbox.cf' \
-
 COPY master.cf /etc/postfix/master.cf
 COPY smtp_header_checks /etc/postfix/smtp_header_checks
 

postfix/postfix.sh

@@ -13,8 +13,9 @@ postconf -e smtpd_tls_cert_file="$TLS_FULLCHAIN"
 
 postconf -e virtual_mailbox_domains="$DOMAINS"
 
-for hash in access_recipient access_sender access_helo;do #virtual;do
+for hash in access_recipient access_sender access_helo virtual;do
 	touch /etc/postfix/$hash
+	chown root:root /etc/postfix/$hash
 	postmap /etc/postfix/$hash
 done