diff --git a/modoboa_installer/scripts/clamav.py b/modoboa_installer/scripts/clamav.py
index a62eda6..181eaf3 100644
--- a/modoboa_installer/scripts/clamav.py
+++ b/modoboa_installer/scripts/clamav.py
@@ -42,7 +42,7 @@ class Clamav(base.Installer):
         """Additional tasks."""
         if package.backend.FORMAT == "deb":
             user = self.config.get(self.appname, "user")
-            if self.config.get("amavis", "enabled").lower() == "true":
+            if self.config.getboolean("amavis", "enabled"):
                 system.add_user_to_group(
                     user, self.config.get("amavis", "user")
                 )
diff --git a/modoboa_installer/scripts/modoboa.py b/modoboa_installer/scripts/modoboa.py
index 4e8d28a..4d9b778 100644
--- a/modoboa_installer/scripts/modoboa.py
+++ b/modoboa_installer/scripts/modoboa.py
@@ -49,24 +49,11 @@ class Modoboa(base.Installer):
         self.instance_path = self.config.get("modoboa", "instance_path")
         self.extensions = self.config.get("modoboa", "extensions").split()
         self.devmode = self.config.getboolean("modoboa", "devmode")
-        # Sanity check for amavis and rspamd
-        self.amavis_enabled = self.sanity_check("modoboa-amavis", "amavis")
-        self.sanity_check("modoboa-rspamd", "rspamd")
-
+        self.amavis_enabled = self.config.getboolean("amavis", "enabled")
         self.dovecot_enabled = self.config.getboolean("dovecot", "enabled")
         self.opendkim_enabled = self.config.getboolean("opendkim", "enabled")
         self.dkim_cron_enabled = False
 
-    def sanity_check(self, extension, plugin):
-        # Sanity check for plugin requirements
-        enabled = False
-        if extension in self.extensions:
-            if self.config.getboolean(plugin, "enabled"):
-                enabled = True
-            else:
-                self.extensions.remove(extension)
-        return enabled
-
     def is_extension_ok_for_version(self, extension, version):
         """Check if extension can be installed with this modo version."""
         version = utils.convert_version_to_int(version)
diff --git a/run.py b/run.py
index 5d0aa3a..1b1c24f 100755
--- a/run.py
+++ b/run.py
@@ -196,9 +196,10 @@ def main(input_args):
     config.set("modoboa", "version", args.version)
     config.set("modoboa", "install_beta", str(args.beta))
 
-    PRIMARY_APPS.append(
-        "amavis" if config.get("antispam", "type") == "amavis" else "rspamd"
-    )
+    if config.get("antispam", "type") == "amavis":
+        PRIMARY_APPS += ["amavis", "opendkim"]
+    else:
+        PRIMARY_APPS += ["rspamd"]
 
     if args.backup or args.silent_backup:
         backup_system(config, args)