diff --git a/defaults/main.yml b/defaults/main.yml
index 7b51800..a143acd 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -16,8 +16,8 @@ dovecot_container: dovecot
 
 # puertos públicos
 postfix_publish_ports:
-  - 25
-  - 587
+  - 25:25
+  - 587:587
 
 # directorio con reglas, relativo al volumen
 postfix_rules_dir: rules
@@ -53,8 +53,8 @@ postfix_mail_home: "{{ vmail_home | default('/srv/mail') }}"
 # LDAP ------------------------------------------------------------------------
 
 # Default LDAP connection parameters
-postfix_ldap_server: "{{ ldap_server | default('localhost') }}"
-postfix_ldap_port: "{{ ldap_port | default(389) }}"
+postfix_ldap_server: "{{ ldap_server | default(ldap_container|default('ldap')) }}"
+postfix_ldap_port: "{{ ldap_port | default(ldap_port|default('389')) }}"
 postfix_ldap_version: "{{ ldap_version | default(3) }}"
 postfix_ldap_scope: "{{ ldap_search_scope | default('sub') }}"
 postfix_ldap_bind: "{{ ldap_bind | default(False) }}"