diff --git a/deploy/README.md b/deploy/README.md
index 44d53225..8cced4d8 100644
--- a/deploy/README.md
+++ b/deploy/README.md
@@ -391,3 +391,23 @@ acme.sh --deploy --deploy-hook mydevil -d example.com
 ```
 
 That will remove old certificate and install new one.
+
+## 15. Deploy your cert to local mailcow server
+
+You can install your certificates to a local [mailcow](https://github.com/mailcow/mailcow-dockerized/) instance. The
+deploy hook will copy the certificates and reload the containers, that use the certificates (`postfix-mailcow`
+`dovecot-mailcow` and `nginx-mailcow`).
+
+```sh
+$ export DEPLOY_MAILCOW_PATH="/path/to/mailcow"
+$ acme.sh --deploy -d example.com --deploy-hook mailcow
+```
+
+The default command to restart is `docker-compose restart postfix-mailcow dovecot-mailcow nginx-mailcow`, if you want a
+custom restart command, specify it by setting `DEPLOY_MAILCOW_RELOAD`:
+
+```sh
+$ export DEPLOY_MAILCOW_PATH="/path/to/mailcow"
+$ export DEPLOY_MAILCOW_RELOAD="docker-compose restart"
+$ acme.sh --deploy -d example.com --deploy-hook mailcow
+```
diff --git a/deploy/mailcow.sh b/deploy/mailcow.sh
new file mode 100644
index 00000000..3a806e83
--- /dev/null
+++ b/deploy/mailcow.sh
@@ -0,0 +1,58 @@
+#!/usr/bin/env sh
+
+#Here is a script to deploy cert to mailcow.
+
+#returns 0 means success, otherwise error.
+
+########  Public functions #####################
+
+#domain keyfile certfile cafile fullchain
+mailcow_deploy() {
+  _cdomain="$1"
+  _ckey="$2"
+  _ccert="$3"
+  _cca="$4"
+  _cfullchain="$5"
+
+  _debug _cdomain "$_cdomain"
+  _debug _ckey "$_ckey"
+  _debug _ccert "$_ccert"
+  _debug _cca "$_cca"
+  _debug _cfullchain "$_cfullchain"
+
+  _mailcow_path="${DEPLOY_MAILCOW_PATH}"
+
+  if [ -z "$_mailcow_path" ]; then
+    _err "Mailcow path is not found, please define DEPLOY_MAILCOW_PATH."
+    return 1
+  fi
+
+  _ssl_path="${_mailcow_path}/data/assets/ssl/"
+  if [ ! -d "$_ssl_path" ]; then
+    _err "Cannot find mailcow ssl path: $_ssl_path"
+    return 1
+  fi
+
+  _info "Copying key and cert"
+  _real_key="$_ssl_path/key.pem"
+  if ! cat "$_ckey" >"$_real_key"; then
+    _err "Error: write key file to: $_real_key"
+    return 1
+  fi
+
+  _real_fullchain="$_ssl_path/cert.pem"
+  if ! cat "$_cfullchain" >"$_real_fullchain"; then
+    _err "Error: write cert file to: $_real_fullchain"
+    return 1
+  fi
+
+  DEFAULT_MAILCOW_RELOAD="cd ${_mailcow_path} && docker-compose restart postfix-mailcow dovecot-mailcow nginx-mailcow"
+  _reload="${DEPLOY_MAILCOW_RELOAD:-$DEFAULT_MAILCOW_RELOAD}"
+
+  _info "Run reload: $_reload"
+  if eval "$_reload"; then
+    _info "Reload success!"
+  fi
+  return 0
+
+}