fix(mailserver): Align Postfix/Dovecot mail paths for Roundcube visibility

- Change mount point from var/mail to home/vmail for proper Dovecot integration
- Update virtual_mailbox_base from /var/mail to /home/vmail
- Create Maildir/{cur,new,tmp} structure matching Dovecot's mail_location
- Fix vmailbox entries to include Maildir/ suffix
- Update vmail user home directory to /home/vmail

This resolves the issue where emails delivered by Postfix were not visible
in Roundcube because Dovecot was looking in ~/Maildir/ subdirectory.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package/secubox/secubox-app-mailserver/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=secubox-app-mailserver
 PKG_VERSION:=1.0.0
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_MAINTAINER:=SecuBox Team
 PKG_LICENSE:=MIT

package/secubox/secubox-app-mailserver/files/usr/lib/mailserver/container.sh

@@ -30,7 +30,7 @@ lxc.net.0.ipv4.address = auto
 lxc.cgroup2.memory.max = 536870912
 lxc.seccomp.profile =
 
-lxc.mount.entry = $data_path/mail var/mail none bind,create=dir 0 0
+lxc.mount.entry = $data_path/mail home/vmail none bind,create=dir 0 0
 lxc.mount.entry = $data_path/config etc/postfix none bind,create=dir 0 0
 lxc.mount.entry = $data_path/ssl etc/ssl/mail none bind,create=dir 0 0
 
@@ -42,7 +42,7 @@ EOF
 	echo "Bootstrapping Alpine rootfs..."
 	local rootfs="$LXC_DIR/$name/rootfs"
 
-	mkdir -p "$rootfs"/{dev,proc,sys,tmp,var/log,var/mail,etc/{postfix,dovecot,ssl/mail}}
+	mkdir -p "$rootfs"/{dev,proc,sys,tmp,var/log,home/vmail,etc/{postfix,dovecot,ssl/mail}}
 
 	# Download and extract Alpine minirootfs
 	local arch="aarch64"
@@ -92,15 +92,15 @@ postconf -e 'virtual_mailbox_domains = /etc/postfix/vdomains'
 # Alpine Postfix uses LMDB, not BerkeleyDB hash
 postconf -e 'virtual_mailbox_maps = lmdb:/etc/postfix/vmailbox'
 postconf -e 'virtual_alias_maps = lmdb:/etc/postfix/valias'
-postconf -e 'virtual_mailbox_base = /var/mail'
+postconf -e 'virtual_mailbox_base = /home/vmail'
 # Copy resolv.conf to Postfix chroot for DNS lookups
 mkdir -p /var/spool/postfix/etc
 cp /etc/resolv.conf /var/spool/postfix/etc/
 postconf -e 'virtual_uid_maps = static:1000'
 postconf -e 'virtual_gid_maps = static:1000'
-# Create vmail user
+# Create vmail user with home at /home/vmail
 addgroup -g 1000 vmail
-adduser -D -u 1000 -G vmail -h /var/mail vmail
+adduser -D -u 1000 -G vmail -h /home/vmail vmail
 # Enable services
 rc-update add postfix default
 rc-update add dovecot default

package/secubox/secubox-app-mailserver/files/usr/lib/mailserver/users.sh

@@ -26,15 +26,17 @@ user_add() {
 	# Validate
 	echo "$email" | grep -qE '^[^@]+@[^@]+\.[^@]+$' || { echo "Invalid email format"; return 1; }
 
-	# Create mailbox directory
-	local maildir="$data_path/mail/$domain/$user"
+	# Create mailbox directory with Maildir structure
+	# Dovecot expects ~/Maildir/ so we create $domain/$user/Maildir/
+	local maildir="$data_path/mail/$domain/$user/Maildir"
 	mkdir -p "$maildir"/{cur,new,tmp}
-	chown -R 1000:1000 "$maildir"
+	chown -R 1000:1000 "$data_path/mail/$domain/$user"
 
-	# Add to virtual mailbox map
+	# Add to virtual mailbox map (path relative to virtual_mailbox_base)
+	# Must end with Maildir/ to match Dovecot's mail_location = maildir:~/Maildir
 	local vmailbox="$data_path/config/vmailbox"
 	touch "$vmailbox"
-	grep -q "^$email" "$vmailbox" || echo "$email $domain/$user/" >> "$vmailbox"
+	grep -q "^$email" "$vmailbox" || echo "$email $domain/$user/Maildir/" >> "$vmailbox"
 
 	# Generate password hash
 	if [ -z "$password" ]; then