diff --git a/devtools/deployments/opencloud_full/config/stalwart/idmldap.toml b/devtools/deployments/opencloud_full/config/stalwart/idmldap.toml
index 269071e624..89e038ac45 100644
--- a/devtools/deployments/opencloud_full/config/stalwart/idmldap.toml
+++ b/devtools/deployments/opencloud_full/config/stalwart/idmldap.toml
@@ -56,6 +56,8 @@ directory.ldap.tls.allow-invalid-certs = true
 directory.ldap.tls.enable = true
 directory.ldap.type = "ldap"
 directory.ldap.url = "ldap://ldap-server:1389"
+email.encryption.enable = true
+email.encryption.append = false
 http.allowed-endpoint = 200
 http.hsts = true
 http.permissive-cors = false