diff --git a/dnsapi/dns_schlundtech.sh b/dnsapi/dns_schlundtech.sh
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+#!/usr/bin/env sh
+# -*- mode: sh; tab-width: 2; indent-tabs-mode: s; coding: utf-8 -*-
+
+# Schlundtech DNS API
+# Author: mod242
+# Created: 2019-40-29
+# Completly based on the autoDNS xml api wrapper by auerswald@gmail.com
+#
+#     export SCHLUNDTECH_USER="username"
+#     export SCHLUNDTECH_PASSWORD="password"
+#
+# Usage:
+#     acme.sh --issue --dns dns_schlundtech -d example.com
+
+SCHLUNDTECH_API="https://gateway.schlundtech.de"
+
+# Arguments:
+#   txtdomain
+#   txt
+dns_schlundtech_add() {
+  fulldomain="$1"
+  txtvalue="$2"
+
+  SCHLUNDTECH_USER="${SCHLUNDTECH_USER:-$(_readaccountconf_mutable SCHLUNDTECH_USER)}"
+  SCHLUNDTECH_PASSWORD="${SCHLUNDTECH_PASSWORD:-$(_readaccountconf_mutable SCHLUNDTECH_PASSWORD)}"
+
+  if [ -z "$SCHLUNDTECH_USER" ] || [ -z "$SCHLUNDTECH_PASSWORD" ]; then
+    _err "You didn't specify schlundtech user and password."
+    return 1
+  fi
+
+  _saveaccountconf_mutable SCHLUNDTECH_USER "$SCHLUNDTECH_USER"
+  _saveaccountconf_mutable SCHLUNDTECH_PASSWORD "$SCHLUNDTECH_PASSWORD"
+
+  _debug "First detect the root zone"
+
+  if ! _get_autodns_zone "$fulldomain"; then
+    _err "invalid domain"
+    return 1
+  fi
+
+  _debug _sub_domain "$_sub_domain"
+  _debug _zone "$_zone"
+  _debug _system_ns "$_system_ns"
+
+  _info "Adding TXT record"
+
+  autodns_response="$(_autodns_zone_update "$_zone" "$_sub_domain" "$txtvalue" "$_system_ns")"
+
+  if [ "$?" -eq "0" ]; then
+    _info "Added, OK"
+    return 0
+  fi
+
+  return 1
+}
+
+# Arguments:
+#   txtdomain
+#   txt
+dns_schlundtech_rm() {
+  fulldomain="$1"
+  txtvalue="$2"
+
+  SCHLUNDTECH_USER="${SCHLUNDTECH_USER:-$(_readaccountconf_mutable SCHLUNDTECH_USER)}"
+  SCHLUNDTECH_PASSWORD="${SCHLUNDTECH_PASSWORD:-$(_readaccountconf_mutable SCHLUNDTECH_PASSWORD)}"
+
+  if [ -z "$SCHLUNDTECH_USER" ] || [ -z "$SCHLUNDTECH_PASSWORD" ]; then
+    _err "You didn't specify schlundtech user and password."
+    return 1
+  fi
+
+  _debug "First detect the root zone"
+
+  if ! _get_autodns_zone "$fulldomain"; then
+    _err "zone not found"
+    return 1
+  fi
+
+  _debug _sub_domain "$_sub_domain"
+  _debug _zone "$_zone"
+  _debug _system_ns "$_system_ns"
+
+  _info "Delete TXT record"
+
+  autodns_response="$(_autodns_zone_cleanup "$_zone" "$_sub_domain" "$txtvalue" "$_system_ns")"
+
+  if [ "$?" -eq "0" ]; then
+    _info "Deleted, OK"
+    return 0
+  fi
+
+  return 1
+}
+
+####################  Private functions below ##################################
+
+# Arguments:
+#   fulldomain
+# Returns:
+#   _sub_domain=_acme-challenge.www
+#   _zone=domain.com
+#   _system_ns
+_get_autodns_zone() {
+  domain="$1"
+
+  i=2
+  p=1
+
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+    _debug h "$h"
+
+    if [ -z "$h" ]; then
+      # not valid
+      return 1
+    fi
+
+    autodns_response="$(_autodns_zone_inquire "$h")"
+
+    if [ "$?" -ne "0" ]; then
+      _err "invalid domain"
+      return 1
+    fi
+
+    if _contains "$autodns_response" "<summary>1</summary>" >/dev/null; then
+      _zone="$(echo "$autodns_response" | _egrep_o '<name>[^<]*</name>' | cut -d '>' -f 2 | cut -d '<' -f 1)"
+      _system_ns="$(echo "$autodns_response" | _egrep_o '<system_ns>[^<]*</system_ns>' | cut -d '>' -f 2 | cut -d '<' -f 1)"
+      _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+      return 0
+    fi
+
+    p=$i
+    i=$(_math "$i" + 1)
+  done
+
+  return 1
+}
+
+_build_request_auth_xml() {
+  printf "<auth>
+    <user>%s</user>
+    <password>%s</password>
+    <context>10</context>
+  </auth>" "$SCHLUNDTECH_USER" "$SCHLUNDTECH_PASSWORD"
+}
+
+# Arguments:
+#   zone
+_build_zone_inquire_xml() {
+  printf "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+  <request>
+    %s
+    <task>
+      <code>0205</code>
+      <view>
+        <children>1</children>
+        <limit>1</limit>
+      </view>
+      <where>
+        <key>name</key>
+        <operator>eq</operator>
+        <value>%s</value>
+      </where>
+    </task>
+  </request>" "$(_build_request_auth_xml)" "$1"
+}
+
+# Arguments:
+#   zone
+#   subdomain
+#   txtvalue
+#   system_ns
+_build_zone_update_xml() {
+  printf "<?xml version=\"1.0\" encoding=\"UTF-8\"?>
+  <request>
+    %s
+    <task>
+      <code>0202001</code>
+      <default>
+        <rr_add>
+          <name>%s</name>
+          <ttl>600</ttl>
+          <type>TXT</type>
+          <value>%s</value>
+        </rr_add>
+      </default>
+      <zone>
+        <name>%s</name>
+        <system_ns>%s</system_ns>
+      </zone>
+    </task>
+  </request>" "$(_build_request_auth_xml)" "$2" "$3" "$1" "$4"
+}
+
+# Arguments:
+#   zone
+_autodns_zone_inquire() {
+  request_data="$(_build_zone_inquire_xml "$1")"
+  autodns_response="$(_autodns_api_call "$request_data")"
+  ret="$?"
+
+  printf "%s" "$autodns_response"
+  return "$ret"
+}
+
+# Arguments:
+#   zone
+#   subdomain
+#   txtvalue
+#   system_ns
+_autodns_zone_update() {
+  request_data="$(_build_zone_update_xml "$1" "$2" "$3" "$4")"
+  autodns_response="$(_autodns_api_call "$request_data")"
+  ret="$?"
+
+  printf "%s" "$autodns_response"
+  return "$ret"
+}
+
+# Arguments:
+#   zone
+#   subdomain
+#   txtvalue
+#   system_ns
+_autodns_zone_cleanup() {
+  request_data="$(_build_zone_update_xml "$1" "$2" "$3" "$4")"
+  # replace 'rr_add>' with 'rr_rem>' in request_data
+  request_data="$(printf -- "%s" "$request_data" | sed 's/rr_add>/rr_rem>/g')"
+  autodns_response="$(_autodns_api_call "$request_data")"
+  ret="$?"
+
+  printf "%s" "$autodns_response"
+  return "$ret"
+}
+
+# Arguments:
+#   request_data
+_autodns_api_call() {
+  request_data="$1"
+
+  _debug request_data "$request_data"
+
+  autodns_response="$(_post "$request_data" "$SCHLUNDTECH_API")"
+  ret="$?"
+
+  _debug autodns_response "$autodns_response"
+
+  if [ "$ret" -ne "0" ]; then
+    _err "error"
+    return 1
+  fi
+
+  if _contains "$autodns_response" "<type>success</type>" >/dev/null; then
+    _info "success"
+    printf "%s" "$autodns_response"
+    return 0
+  fi
+
+  return 1
+}