diff --git a/.env.example b/.env.example
index a979240c..ac76ee16 100644
--- a/.env.example
+++ b/.env.example
@@ -31,6 +31,9 @@ EMAIL_SERVERS_WITH_PRIORITY=[(10, "email.hostname.")]
 
 # the DKIM private key used to compute DKIM-Signature
 DKIM_PRIVATE_KEY_PATH=local_data/dkim.key
+
+# the DKIM public key used to setup custom domain DKIM
+DKIM_PUBLIC_KEY_PATH=local_data/dkim.pub.key
 # <<< END Email related settings >>>
 
 
diff --git a/tests/env.test b/tests/env.test
index 87246925..470aeb13 100644
--- a/tests/env.test
+++ b/tests/env.test
@@ -11,6 +11,7 @@ ADMIN_EMAIL=to_fill
 MAX_NB_EMAIL_FREE_PLAN=3
 EMAIL_SERVERS_WITH_PRIORITY=[(10, "email.hostname.")]
 DKIM_PRIVATE_KEY_PATH=local_data/dkim.key
+DKIM_PUBLIC_KEY_PATH=local_data/dkim.pub.key
 
 # Database
 RESET_DB=true