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IMAP authentication

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Installation
Download the latest version of mod_auth_imap:

cd /extra/src
wget http://ben.brillat.net/files/projects/mod_auth_imap2/mod_auth_imap2-current.tar.gz
tar zxf mod_auth_imap2-current.tar.gz
cd mod_auth_imap2-2.2.0

If you use Dovecot, you'll need apply a patch:
wget http://path/to/patch
patch < ../dovecot_mod_auth_imap.patch

Outlook and IMAP

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Add-ons for Microsoft Outlook which improves it's usage as an IMAP client.

  • Toltec Connector - The Toltec Connector synchronizes the calendars, contacts, tasks, mails and other folders in Microsoft Outlook to an IMAP4 server. This enables you to share the information on the server with other Toltec enabled Outlook mail clients. Using the Toltec Connector with the Kolab-XML format you can share the information with other Kolab-XML clients like Kontact and Horde as well.

Shared IMAP folders

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Create shared IMAP folders that multiple users can access.

http://scott.yang.id.au/2003/08/another-look-at-shared-spam-folder-under-courier-imap/
http://www.flatmtn.com/article/setting-courier-imap

Mail.app in OS X 10.3 doesn't see the Shared folders? Something with the INBOX prefix wackiness of OS X?
Thunderbird - couldn't get it to see the subfolders of a shared folder.

Archiving

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One of the problems with an IMAP server is a problem with the users - they're lazy and don't like cleaning up their mailbox. While you can specify an age in CourierIMAP for messages in the Trash, some environments just wouldn't like your server deleting messages at whim. Plus, there's some users who can't be bothered even deleting messages out of their Inbox and instead let it balloon to thousands of messages (and then whine to you when their email client slows to a snail's pace).

Archivemail is a utility for archiving and compressing old mail on your server so you can clean up space on your IMAP server without permanently deleting the messages (unless you want to). The messages are put into an mbox file that can be put on a CD/DVD or another computer. If users need to get into the archives, they can use an email client, or a program like mboxview to access their archived mail.

Dovecot

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Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind. Dovecot is an excellent choice for both small and large installations. It's fast, simple to set up, requires no special administration and it uses very little memory.

Installation
Download the latest tarball of the Dovecot source:

cd /extra/src
wget http://dovecot.org/releases/2.0/dovecot-2.0.17.tar.gz
tar zxf dovecot-2.0.17.tar.gz
cd dovecot-2.0.17

Configure Dovecot with support for vpopmail, compile and install it. If you want POP3 as well as IMAP, you need to specify it in the configure options.
./configure --with-vpopmail
make
make install

Create the necessary users and group for Dovecot to run as:

groupadd dovecot
useradd -g dovecot -s /bin/false -c "Dovecot Mail Server" dovecot

Courier-IMAP

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Courier-IMAP is a fast, scalable, enterprise IMAP server that uses Maildirs. Many E-mail service providers use Courier-IMAP to easy handle hundreds of thousands of mail accounts.

Prerequisites
Courier installation requires the gdbm development tools:

yum -y install gdbm-devel

Courier-Authlib
The Courier authentication library provides authentication services for the Courier programs which we'll be using on our server to provide IMAP and POP3 on the mail server. While it does support system passwords, LDAP, and MySQL, we'll be using authvchkpw to integrate it with vpopmail.

Download the latest tarball:

cd /extra/src

IMAP and POP3

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What good is a mail server if users can't get mail off it? There are a couple of good options for providing IMAP and POP3 services to your server.

The usual option has been the Courier-IMAP but there are also now instructions for installing an alternate IMAP server: Dovecot.

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