feat(mailserver): Add alias management via ubus

- Fix alias_add RPCD to read JSON from stdin (ubus compatibility)
- Add alias_del function to users.sh
- Add alias del command to mailctl
- Add alias_del RPCD method

Tested: alias_add, alias_list, alias_del all work via ubus call

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

package/secubox/luci-app-mailserver/root/usr/libexec/rpcd/luci.mailserver

@@ -23,6 +23,7 @@ case "$1" in
 			"user_del": { "email": "string" },
 			"user_passwd": { "email": "string", "password": "string" },
 			"alias_add": { "alias": "string", "target": "string" },
+			"alias_del": { "alias": "string" },
 			"dns_setup": {},
 			"ssl_setup": {},
 			"webmail_configure": {},
@@ -275,7 +276,13 @@ case "$1" in
 				;;
 
 			alias_add)
-				json_load "$3"
+				# Read JSON from stdin or $3
+				if [ -n "$3" ]; then
+					json_load "$3"
+				else
+					read -r _input
+					json_load "$_input"
+				fi
 				json_get_var aalias alias
 				json_get_var target target
 
@@ -291,6 +298,28 @@ case "$1" in
 				json_dump
 				;;
 
+			alias_del)
+				# Read JSON from stdin or $3
+				if [ -n "$3" ]; then
+					json_load "$3"
+				else
+					read -r _input
+					json_load "$_input"
+				fi
+				json_get_var aalias alias
+
+				json_init
+				if [ -z "$aalias" ]; then
+					json_add_int "code" 1
+					json_add_string "error" "Alias required"
+				else
+					output=$($MAILCTL alias del "$aalias" 2>&1)
+					json_add_int "code" "$?"
+					json_add_string "output" "$output"
+				fi
+				json_dump
+				;;
+
 			dns_setup)
 				json_init
 				output=$($MAILCTL dns-setup 2>&1)

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

@@ -156,6 +156,27 @@ alias_add() {
 	echo "Alias added: $alias → $target"
 }
 
+# Delete alias
+alias_del() {
+	local alias="$1"
+
+	[ -z "$alias" ] && { echo "Usage: alias_del <alias@domain>"; return 1; }
+
+	local container=$(get_container)
+	local data_path=$(get_data_path)
+	local valias="$data_path/config/valias"
+
+	if [ ! -f "$valias" ] || ! grep -q "^$alias " "$valias"; then
+		echo "Alias not found: $alias"
+		return 1
+	fi
+
+	sed -i "/^$alias /d" "$valias"
+	lxc-attach -n "$container" -- postmap /etc/postfix/valias 2>/dev/null
+
+	echo "Alias deleted: $alias"
+}
+
 # List aliases
 alias_list() {
 	local data_path=$(get_data_path)

package/secubox/secubox-app-mailserver/files/usr/sbin/mailctl

@@ -172,10 +172,12 @@ cmd_alias() {
 
 	case "$action" in
 		add)   alias_add "$@" ;;
+		del)   alias_del "$@" ;;
 		list)  alias_list ;;
 		*)
 			echo "Alias commands:"
 			echo "  alias add <alias> <target>  Add email alias"
+			echo "  alias del <alias>           Delete email alias"
 			echo "  alias list                  List aliases"
 			;;
 	esac