diff --git a/cmdeploy/src/cmdeploy/__init__.py b/cmdeploy/src/cmdeploy/__init__.py
index 3d0a03bc..c453c420 100644
--- a/cmdeploy/src/cmdeploy/__init__.py
+++ b/cmdeploy/src/cmdeploy/__init__.py
@@ -451,6 +451,7 @@ def deploy_chatmail(config_path: Path) -> None:
 
     server.group(name="Create vmail group", group="vmail", system=True)
     server.user(name="Create vmail user", user="vmail", group="vmail", system=True)
+    server.user(name="Create filtermail user", user="filtermail", system=True)
     server.group(name="Create opendkim group", group="opendkim", system=True)
     server.user(
         name="Create opendkim user",
diff --git a/cmdeploy/src/cmdeploy/service/filtermail.service.f b/cmdeploy/src/cmdeploy/service/filtermail.service.f
index 59748394..d0f9d3f5 100644
--- a/cmdeploy/src/cmdeploy/service/filtermail.service.f
+++ b/cmdeploy/src/cmdeploy/service/filtermail.service.f
@@ -5,6 +5,7 @@ Description=Chatmail Postfix before queue filter
 ExecStart={execpath} {config_path}
 Restart=always
 RestartSec=30
+User=filtermail
 
 [Install]
 WantedBy=multi-user.target