Email server with Postfix, Dovecot, and LDAP

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I think I'll skip the introduction as this is mainly a note for myself

The LDAP Setup

I'm not going to cover how to setup LDAP. The setup that I'm using for this system is organized where all users are under an Organizational Unit called 'people' (ou=people,dc=organization,dc=org) with this schema:

dn: uid=user,ou=people,dc=organization,dc=org
objectClass: posixAccount
objectClass: inetOrgPerson
uid: user
homeDirectory: /home/user
userPassword: <passwordhash>


Configuring Dovecot

Add these into dovecot.conf 

mail_uid = 5000
mail_gid = 5000

auth default {
  mechanisms = plain
  passdb ldap {
          args = /etc/dovecot-ldap.pass
  }
  userdb ldap {
          args = /etc/dovecot-ldap.user
  }

  # for postfix to authenticate against
  socket listen {
        client {
          # Assuming the default Postfix $queue_directory setting
          path = /var/spool/postfix/private/auth
          mode = 0660
          # Assuming the default Postfix user and group
          user = postfix
          group = postfix
  }
}

dovecot-ldap.pass

hosts = host.of.ldap.server:389
sasl_bind = no
auth_bind = yes
ldap_version = 3
deref = never
base = uid=%n,ou=people,dc=organization,dc=org
scope = base
dn = uid=manager,dc=organization,dc=org
dnpass = password

dovecot-ldap.user

hosts = host.of.ldap.server:389
sasl_bind = no
auth_bind = yes
ldap_version = 3
deref = never
base = uid=%n,ou=people,dc=organization,dc=org
scope = base
user_attrs = homeDirectory=home
dn = uid=manager,dc=organization,dc=org
dnpass = password


Configuring Postfix

Add these into your main.cf

accounts_server_host = host.of.ldap.server
accounts_search_base = ou=people,dc=organization,dc=org
accounts_query_filter = (&(objectClass=inetOrgPerson)(mail=%s))
accounts_result_attribute = homeDirectory
accounts_result_format  =  %s/Mailbox
accounts_scope = sub
accounts_cache = yes
accounts_bind = yes
accounts_bind_dn = uid=manager,dc=organization,dc=org
accounts_bind_pw = password
accounts_version = 3

virtual_transport = virtual
virtual_uid_maps = static:5000
virtual_gid_maps = static:5000
virtual_mailbox_base = /
virtual_mailbox_maps = ldap:accounts
virtual_mailbox_domains = organization.org

smtpd_sasl_type = dovecot
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = no
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_sasl_path = private/auth

Make sure domains under virtual_mailbox_domains is not listed under mydestinations.

Thats it I think, not sure if I missed anyting.

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