diff --git a/defaults/main.yml b/defaults/main.yml
index 34b524f..6f08895 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -26,7 +26,7 @@ roundcube_imap_host: "tls://{{ dovecot_container | default('localhost') }}"
 roundcube_imap_port: "143"
 
 # smtp
-roundcube_smtp_host: "tls://{{ dovecot_container | default('localhost') }}"
+roundcube_smtp_host: "tls://{{ postfix_container | default('localhost') }}"
 roundcube_smtp_port: "587"
 
 # plugins