postfix, ldap and mailforward

I wanted to setup and postfix based on ldap with the following features:

• each user in ldap-structure has one mailbox
• each user can have one or more mailadresses that will end in the users mailbox
• each user can have one or more forwardadresses

Solution:

Using standard ldap-users with following ObjectClasses:

• posixAccount
• shadowAccount
• mailUser (from a non-standard ldap-mail-schema - see below)

The following attributes are relevant for the above features:

• uid : username and name of the mailbox where the mail is delivered
• mail: one or more adresses of this user
• mailAlternateAddress: one or more forwarding adresses

I enabled virtual_maps in postfix/main.cf:

virtual_maps = ldap:/etc/postfix/ldap-aliases.cf

and ldap-aliases.cf looks like:

server_host = ldap://127.0.0.1

search_base = dc=ihf,dc=local
query_filter = (mail=%s)

result_attribute = uid, mailAlternateAddress

version = 3

I found this schema on the internet, cause I didnt want to use the qmail-schema which was much to big and complex for my needs and I didnt want to use the misc-schema, cause many sources tell you not to do !!

attributetype ( 1.3.6.1.4.1.7914.1.2.1.4 NAME 'mailAlternateAddress'
 DESC 'Secondary (alias) mailaddresses for the same user'
 EQUALITY caseIgnoreIA5Match
 SUBSTR caseIgnoreIA5SubstringsMatch
 SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

attributetype ( 1.3.6.1.4.1.7914.1.2.1.5 NAME 'mailDrop'
        DESC 'Where to drop or send the message'
        EQUALITY caseIgnoreIA5Match
        SUBSTR caseIgnoreIA5SubstringsMatch
        SYNTAX 1.3.6.1.4.1.1466.115.121.1.26 SINGLE-VALUE )

attributetype ( 1.3.6.1.4.1.7914.1.2.1.7 NAME 'mailForwardingAddress'
 DESC 'Address(es) to forward all incoming messages to.'
 EQUALITY caseIgnoreIA5Match
 SUBSTR caseIgnoreIA5SubstringsMatch
 SYNTAX 1.3.6.1.4.1.1466.115.121.1.26{256} )

# Object Class Definitions

objectclass ( 1.3.6.1.4.1.7914.1.2.2.1 NAME 'mailUser'
 DESC 'Mail-LDAP User'
 SUP top
 AUXILIARY
 MUST ( cn $ mail )
 MAY ( uid $ userPassword $ mailAlternateAddress $
       mailForwardingAddress $ mailDrop ) )