diff --git a/docs/ecolyo/application/services.md b/docs/ecolyo/application/services.md
index c93b293fe2151b4ed31698a6c3b618caeff5344c..9fba35ad5599200adfb2955f98daec69eeb986a1 100644
--- a/docs/ecolyo/application/services.md
+++ b/docs/ecolyo/application/services.md
@@ -37,3 +37,10 @@ Main steps are the following:
  - Fetches metadata to customize the mail (Public name, instance url).
  - Build the mail.
  - Send the mail.
+
+### Sending mail
+
+Doc of cozy for sendmail worker: https://docs.cozy.io/en/cozy-stack/workers/#sendmail-worker
+
+!!! Send mail in local
+    In local you can use the mail hog tools to see the mail sent by the stack using http://cozy.tools:8025/
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