diff --git a/.gitignore b/.gitignore
index c7b4dfd..485d046 100644
--- a/.gitignore
+++ b/.gitignore
@@ -25,3 +25,5 @@ Data.fs*
 .DS_Store
 coverage
 test
+
+*.dkim.key
diff --git a/development.ini b/development.ini
index 8d53486..d66ba71 100644
--- a/development.ini
+++ b/development.ini
@@ -49,6 +49,17 @@ app.bucket.secure_uploads.get_endpoint = https://plan-period-files.nyc3.cdn.digi
 app.bucket.secure_uploads.access_key = ${MPS_APP_SECURE_UPLOADS_ACCESS_KEY}
 app.bucket.secure_uploads.secret_key = ${MPS_APP_SECURE_UPLOADS_SECRET_KEY}
 
+
+# set this to the path of your private DKIM key.
+# reference: https://russell.ballestrini.net/quickstart-to-dkim-signed-email-with-python/
+app.email.dkim_private_key_path = ${MPS_APP_DKIM_PRIVATE_KEY_PATH}
+app.email.dkim_selector = ${MPS_APP_DKIM_SELECTOR}
+
+# choices: rsa-sha256 or ed25519-sha256
+#app.email.dkim_signature_algorithm = ed25519-sha256
+
+
+
 [pshell]
 setup = make_post_sell.scripts.pshell.setup