diff --git a/roles/mail_server/molecule/default/group_vars/parameters-optional.yml b/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
index 61f2866d22c853195c887f707ef4fb2ac3c37141..8453b04069f82b09cb18fdb21f8fad323d51f125 100644
--- a/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
+++ b/roles/mail_server/molecule/default/group_vars/parameters-optional.yml
@@ -35,6 +35,7 @@ mail_server_smtp_additional_configuration: |
 # Variables dependant on distribution release.
 release_based_smtp_allow_relay_from:
   bullseye: "192.168.56.41"
+  bookworm: "192.168.56.21"
 
 # common
 ca_certificates: