diff --git a/README.md b/README.md
index 89d0526..1192060 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,12 @@ uv run --env-file=.env src/manage.py runserver
 
 This will start the development server on http://localhost:8000.
 
+For testing mail sending, `smtp4dev` can be used:
+
+```
+docker run --rm -it -p 5000:80 -p 2525:25 docker.io/rnwood/smtp4dev
+```
+
 ## Configuration
 
 Configuration happens using environment variables.