diff --git a/conf/app.ini b/conf/app.ini
index 5c3f670..11144c2 100644
--- a/conf/app.ini
+++ b/conf/app.ini
@@ -33,6 +33,7 @@ LOCAL_ROOT_URL = http://127.0.0.1:__PORT__/
 
 [mailer]
 ENABLED = true
+PROTOCOL = smtp
 SMTP_ADDR = localhost
 SMTP_PORT = 25
 FROM = "Forgejo" <forgejo-noreply@__DOMAIN__>