diff --git a/README.md b/README.md
index 0382fcf..1a967f2 100644
--- a/README.md
+++ b/README.md
@@ -101,4 +101,9 @@ The following locations are supported:
 
     curl -u nobody:SIGNAL_API_PASS -X POST -H "Content-Type: application/json" --data '{"message":"hallo world"}' localhost:5000/send-all
 
+# Additional Packages Required
+
+The following additional packages might be requried (on Debian) to successfully install the `python-ldap`-requirement:
+
+    apt install libsasl2-dev python-dev libldap2-dev libssl-dev
 
diff --git a/interface.py b/interface.py
index dc324d7..7bacf1e 100755
--- a/interface.py
+++ b/interface.py
@@ -86,6 +86,38 @@ def sendToAllIcinga():
     sendMessageToAllClients(message)
     return ("","204")
 
+@app.route('/smart-send', methods=["POST"])
+@login_required
+def smart_send_to_clients():
+    '''Send to clients based on querying the LDAP
+        requests MAY include:
+            - list of usernames under key "users"
+            - list of groups    under key "groups"
+            - neither of the above to automatically target the configured administrators group"
+        retuest MUST include:
+            - message as STRING in field "msg"
+            OR
+            - supported struct of type "ICINGA|ZABBIX|GENERIC" (see docs) in field "data"
+    '''
+
+    instructions = flask.request.json
+
+    users = instructions.get("users")
+    groups = instructions.get("groups")
+    message = instructions.get("msg")
+
+    struct = instructions.get("data")
+    if struct:
+        try:
+            message = messagetools.load_struct(struct)
+        except messagetools.UnsupporedStruct() as e:
+            return (408, e.response())
+
+
+    persons = ldaptools.select_targets(users, groups, app.config["LDAP_ARGS"])
+    signal.bulk_dispatch(persons, message)
+    return (200, "OK")
+
 @app.before_first_request
 def init():
     app.config["PASSWORD"] = os.environ["SIGNAL_API_PASS"]
@@ -99,8 +131,28 @@ if __name__ == "__main__":
     parser.add_argument('--port', default="5000", help='Port on which to listen')
     parser.add_argument("--signal-cli-bin", default=None, type=str,
                             help="Path to signal-cli binary if no in $PATH")
+
+
+    parser.add_argument('--ldap-server')
+    parser.add_argument('--ldap-base-dn')
+    parser.add_argument('--ldap-manager-dn')
+    parser.add_argument('--ldap-manager-password')
+
     args = parser.parse_args()
 
+    # define ldap args #
+    ldap_args = {
+        "LDAP_SERVER" : args.ldap_server,
+        "LDAP_BIND_DN" : args.manager_dn,
+        "LDAP_BIND_PW" : args.manager_password,
+        "LDAP_BASE_DN" : args.ldap_base_dn,
+    }
+    
+    if not any([value is None for value in ldap_args.values()]):
+        app.config["LDAP_ARGS"] = ldap_args
+    else:
+        app.config["LDAP_ARGS"] = None
+
     app.config["SIGNAL_CLI_BIN"] = os.path.expanduser(args.signal_cli_bin)
     app.config["PASSWORD"] = os.environ["SIGNAL_API_PASS"]
 
diff --git a/ldaptools.py b/ldaptools.py
new file mode 100644
index 0000000..76a5076
--- /dev/null
+++ b/ldaptools.py
@@ -0,0 +1,111 @@
+import ldap
+
+# LDAP server details
+ldap_server = "ldap://localhost:5005"
+base_dn = "ou=People,dc=atlantishq,dc=de"
+manager_dn = "cn=Manager,dc=atlantishq,dc=de"
+manager_password = "flanigan"
+
+class Person:
+
+    def __init__(self, cn, username, name, email, phone):
+
+        self.cn = cn
+        self.username = username
+        self.name = name
+        self.email = email
+        self.pohon = phone
+
+def ldap_query(search_filter, ldap_args, alt_base_dn=None):
+    
+    ldap_server = ldap_args["LDAP_SERVER"]
+    manager_dn = ldap_args["LDAP_BIND_DN"]
+    manager_pw = ldap_args["LDAP_BIND_PW"]
+    base_dn = ldap_args["LDAP_BASE_DN"]
+
+    # for example a specific user dn #
+    if alt_base_dn:
+        base_dn = alt_base_dn
+
+    # estabilish connection
+    conn = ldap.initialize(ldap_server)
+    conn.simple_bind_s(manager_dn, manager_password)
+
+    # search in scope #
+    search_scope = ldap.SCOPE_SUBTREE
+    search_results = conn.search_s(base_dn, search_scope, search_filter)
+   
+    # unbind from connection and return #
+    conn.unbind_s()
+    return search_results
+
+def _person_from_search_result(cn, entry):
+
+    username = entry.get("uid", [None])[0]
+    name = entry..get("firstName", [None])[0]
+    email = entry.get("email", [None])[0]
+    phone = entry.get("telephoneNumber", [None])[0]
+
+    return Person(cn, username, name, email, phone)
+
+def get_user_by_uid(username):
+
+    if not username:
+        return None
+
+    search_filter = "(&(objectClass=inetOrgPerson)(uid={username}))".format(username)
+    results = ldap_query(search_filter, ldap_args)
+    
+    if not results or len(results) < 1:
+        return None
+
+    cn, p = results[0]
+    return _person_from_search_result(cn, p)
+
+
+def get_members_of_group(group, ldap_args):
+
+    if not group:
+        return []
+
+    search_filter = "(&(objectClass=groupOfNames)(cn={group_name})".format(group)
+    results = ldap_query(search_filter, ldap_args)
+
+    if not results:
+        return []
+    
+    group_dn, entry = results[0]
+    members = entry.get("member", [])
+
+    persons = []
+    for member in members:
+
+        user_dn = member.decode("utf-8")
+        user_filter = "(objectClass=inetOrgPerson)"
+        results = ldap_query(user_filter, ldap_args, alt_base_dn=user_dn)
+
+        if not results:
+            continue
+
+        cn, entry = results[0]
+        person_obj = _person_from_search_result(cn, entry)
+        persons.append(person_obj)
+
+    return persons
+
+
+def select_targets(users, groups, ldap_args, admin_group="pki"):
+    '''Returns a list of persons to send notifications to'''
+
+    persons = []
+    if users:
+        for username in users:
+            persons.append(get_user_by_uid(username))
+    elif groups:
+        for group in groups:
+            persons.append(get_members_of_group(group))
+    else:
+        # send to administrators #
+        persons.append(get_members_of_group())
+
+    return persons