Mail system

Mail delivery configuration with LDAP

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Last time I wrote about users’ authentication in LDAP directory to allow them receiving and sending e-mails. Now is time to configure Postfix for mail delivery to appropriate mailboxes.
If you compile Postfix themselves, you need to remember to add support for LDAP. My description is based on Ubuntu, so I only need to install postfix-ldap package:

$ sudo -i
# apt-get install postfix-ldap

This will add support for ldap: maps in Postfix.

Now we go to Postfix configuration:

# cd /etc/postfix
# vi main.cf

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Mail system authentication in LDAP

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I suppose that Dovecot and Postfix are up and running, and you can receive and send mail with system user (see previous posts). It is time to configure authentication in LDAP.

Use of directory service to user authentication allows for flexible management of mail system, hosting and so on. LDAP is established standard for authentication and authorization and almost all software which requires authentication support this protocol.

Let’s begin from POP3/IMAP Dovecot server, which also deliver authentication mechanism for Postfix:


/usr/bin/sudo -i
cd /etc/dovecot
vi dovecot-ldap.conf

In this file you need to define LDAP server/s parameters, authentication method, filter and attributes. I list those most important:


hosts = localhost
auth_bind = yes
base = o=hosting,dc=example,dc=com
scope = subtree
user_attrs = homeDirectory=home
user_filter = (&(objectClass=mailUser)(mail=%u))
pass_attrs = mail=user,userPassword=password
pass_filter = (&(objectClass=mailUser)(mail=%u))

dovecot-2.0-sieve-0.2.0

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Pigeonhole – Sieve Support for Dovecot

Projekt Pigeonhole is the name of the project that adds support for the Sieve language (RFC 5228) and the ManageSieve protocol (RFC 5804) to the Dovecot Secure IMAP Server. In the literal sense, a pigeonhole is a a hole or recess inside a dovecot for pigeons to nest in. It is, however, also the name for one of a series of small, open compartments in a cabinet used for filing or sorting mail. As a verb, it describes the act of putting an item into one of those pigeonholes. The name `Pigeonhole’ therefore well describes an important part of the functionality that this project adds to Dovecot: sorting and filing e-mail messages.

Source: http://pigeonhole.dovecot.org/