added needed scripts for alias management

target/bin/addalias

@@ -0,0 +1,30 @@
+#! /bin/bash
+
+DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-virtual.cf}
+
+EMAIL="$1"
+RECIPIENT="$2"
+
+usage() {
+	echo "Usage: addalias <user@domain> <recipient@other>"
+}
+
+errex() {
+	echo "$@" 1>&2
+	exit 1
+}
+
+escape() {
+	echo "${1//./\\.}"
+}
+
+[ -z "$EMAIL" ] && { usage; errex "no email specified"; }
+
+grep -qi "^$(escape $EMAIL)[a-zA-Z@.\ ]*$(escape $RECIPIENT)" $DATABASE 2>/dev/null &&
+	errex "Alias \"$EMAIL $RECIPIENT\" already exists"
+
+if grep -qi "^$(escape $EMAIL)" $DATABASE 2>/dev/null; then
+        sed -i '' "/$EMAIL/s/$/ $RECIPIENT/" $DATABASE
+    else
+        echo "$EMAIL $RECIPIENT" >> $DATABASE
+fi

target/bin/delalias

@@ -0,0 +1,30 @@
+#! /bin/bash
+
+DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-virtual.cf}
+
+EMAIL="$1"
+RECIPIENT="$2"
+
+usage() {
+	echo "Usage: delalias <user@domain> <recipient@other>"
+}
+
+errex() {
+	echo "$@" 1>&2
+	exit 1
+}
+
+escape() {
+	echo "${1//./\\.}"
+}
+
+[ -z "$EMAIL" ] || [ -z "$RECIPIENT" ]  && { usage; errex "No email specifed"; }
+[ -s "$DATABASE" ] || exit 0
+
+CNT=$(grep "^$EMAIL" $DATABASE | wc -w | awk '{print $1}')
+
+if [[ $CNT -eq 2 ]]; then
+        sed -i '' "/^$EMAIL/d" $DATABASE
+    else
+        sed -i '' "/^$EMAIL/s/ $RECIPIENT//g" $DATABASE
+fi

target/bin/listalias

@@ -0,0 +1,13 @@
+#! /bin/bash
+
+DATABASE=${DATABASE:-/tmp/docker-mailserver/postfix-virtual.cf}
+
+errex() {
+	echo "$@" 1>&2
+	exit 1
+}
+
+[ -f $DATABASE ] || errex "No postfix-virtual.cf file"
+[ -s $DATABASE ] || errex "Empty postfix-virtual.cf - no aliases have been added"
+
+cat $DATABASE