The first draft of a new document to help integrate Exim with groupware servers such as Exchange and Notes.

Imapsync is a tool for facilitating incremental recursive IMAP transfers from one mailbox to another. It is useful for mailbox migration, and reduces the amount of data transferred by only copying messages that are not present on both servers.

Read, unread, and deleted flags are preserved, and the process can be stopped and resumed. The original messages can optionally be deleted after a successful transfer. 

http://freshmeat.net/projects/imapsync/ 

A guide to reducing spam.

Written by Chris Wilson of Aptivate.

The first draft of a new document which details the steps required to install a simple SMTP/POP3/IMAP server with Debian Etch, Exim4 and Dovecot.

Three-time winner of LinuxWorld Best in Show

Scalix Collaboration Platform named "Best Messaging Solution" three times by LinuxWorld Product Excellence Awards.

Scalix messaging products dramatically reduce your total cost of ownership. Our Linux-based Collaboration Platform gives you 99.999% availability with clustering and failover. Our message store uses a native Linux file system which is rock solid and eliminates the need for you to manage a database. Our Mail Server typically supports 50%-100% more users per server than Exchange, so you can consolidate servers. With our SmartCache processing on local machines, you can centralize messaging servers and eliminate the complexity of managing distributed systems.

http://www.scalix.com 

QEMU is a generic and open source machine emulator and virtualizer.

When used as a machine emulator, QEMU can run OSes and programs made for one machine (e.g. an ARM board) on a different machine (e.g. your own PC). By using dynamic translation, it achieves very good performances.

When used as a virtualizer, QEMU achieves near native performances by executing the guest code directly on the host CPU. A host driver called the QEMU accelerator (also known as KQEMU) is needed in this case. The virtualizer mode requires that both the host and guest machine use x86 compatible processors.

http://fabrice.bellard.free.fr/qemu/ 

swaks - Swiss Army Knife SMTP; Command line SMTP testing, including TLS and AUTH.

Highly recommended. Very useful. 

http://jetmore.org/john/code/ 

If you are new to Exim the following section is for you.

We cover the basic requirements and responsibilities for running your own mailservere...

Some of the problems on the Exim-Users mailing list are caused becuase people are using Exim3 documentation with Exim4 Servers. Exim4 was released in 2002. Exim4 replaces Exim3.

• Introduction to Debian GNU/Linux
• Exim 3 in Debian: Status and Experiences
• Debian packaging and administration mechanisms
• Design Requirements and Design Decisions for exim 4 packaging
• Anatomy and mechanisms of the Debian exim 4 packages
• Challenges faced during packaging
• Four methods of configuration
• Experiences

In 2005 UIT Cambridge and The UK Unix Users Group (UKUUG) organized the First International Exim Conference and Tutorial. More information and the papers presented at the conference can be found here: 

http://www.uit.co.uk/exim-conference/  

SMTP Reply Codes by Function Groups

Debian and Ubuntu users can find additional resources and mailing lists at the following locations: 

The official pkg-exim4-users mailing list: 

http://lists.alioth.debian.org/mailman/listinfo/pkg-exim4-users

Additional pkg-exim4 information can be found at:

http://wiki.debian.org/PkgExim4

Here is an example of an Exim configuration file that will:

Accept messages FOR the domain example.com.

Accept messages FROM itself (127.0.0.1) and two other ranges of IP addresses (10.0.0.0/8 and 192.168.0.0/16).

This config has very few features but is still functional enough to work (on a test system that is not accesible from the Internet).

This config also assumes that if you wish to send an email to This e-mail address is being protected from spam bots, you need JavaScript enabled to view it , that alice has a valid account and mailbox on the Exim server itself. 

SMTP Reply Codes in Numeric Order

Eximstate is a web based queue monitoring tool written by Ollie Cook.

Here we use two additional files to store a list of local domains that we will accept messages for and a list of IP addresses that we will accept messages from. This is still avery simple configuration that does not have any specific sections to guard against spam and virues, however a complete full-blown configuration example would often be overewhelming for a new user. This config is made up of three seperate files:

/etc/exim/exim.conf

/etc/exim/exim-accept-mail-for-this-list-of-local-domains.txt

/etc/exim/exim-accept-mail-from-this-list-of-ip-addresses.tx

SMTP Reply Code Severities and Theory

An Example configuration file taken from a defualt installation of Red Hat Enterprise Linux or CentOS.  This file is similar to the one you would find in the /etc/exim/ directory on a server running exim v4.43.

 An example of an advanced and extremely complicated Exim configuration file can be found here:

(I have no idea how it works but apparently it does. This is based on the Exim configuration used at Cambridge University, the birthplace of Exim) 

http://www-uxsup.csx.cam.ac.uk/~fanf2/hermes/doc/talks/2005-02-eximconf/  

Mail Transfer Agents - Tool for the Job

For a lot of people the choice of the Mail Transfer Agent is important. The wrong choice can mean lost time and money, lower reliability and increased risk to networks.

Read the full article...

http://www.shearer.org/MTA_Comparison

This document briefly describes how to install and configure the following items of software,

so that they work together to provide not only e-mail handling, but realtime spam and virus scanning:

• Exim 4.x (this version refers to 4.20+ but most parts are applicable to earlier versions of Exim 4)

• Exiscan/Exiscan-ACL (this document refers to Exiscan-ACL release 22+)

• SA-Exim (this document refers to version 3.0+)

• SpamAssassin

• Clam Antivirus/Sophos Antivirus/sophie

EtherApe is a graphical network monitor for Unix modeled after etherman. Featuring link layer, ip and TCP modes, it displays network activity graphically. Hosts and links change in size with traffic. Color coded protocols display.

It supports Ethernet, FDDI, Token Ring, ISDN, PPP and SLIP devices. It can filter traffic to be shown, and can read traffic from a file as well as live from the network.

http://etherape.sourceforge.net/ 

Tutorial - Advanced routing and security for vulnerable hosts

The paper discusses a method for removing the risks associated with presenting Microsoft Exchange directly to the Internet. It addresses issues for administrators who must use Exchange in a corporate environment, but have concerns over its ability to protect the valuable resources it holds, or its ability to provide advanced routing and filtering of messages before delivery.

The tutorial shows a real-life example of Exim in use as an SMTP gateway to an internal Exchange server, providing a level of separation from internet based enumeration tactics and exploits.

The tutorial provides a mechanism for:

• Proving temporary redirection by Domain.

• Providing permanent redirection by email address.

• Restricting the domains allowed for relay and delivery.

• Restricting IP addresses allowed for relay and delivery.

• Sending and receiving mail via a dedicated appliance or third party Virus/Spam/Porn scanning service such as Messagelabs.

By default Debian and Ubuntu offer a different configuration system than other distributions.

Some users run into problems with this alternate configuration method becuase they fail to locate and read the relevant documentation.

The current README.debian is provided in this article, please read this BEFORE posting a Debian or Ubuntu specific question on the exim-users mailing list. (UPDATED June 2007)

POP vs IMAP for Inboxes

Client-server email is still useful even in this day of massive public webmail. This note is for people interested in the POP and IMAP protocols used to access client-server email. There is an enduring myth that there is some circumstance in which POP is better than IMAP, whether for the user or the provider. So here's the answer!

Read the full article...

http://www.shearer.org/POP_vs_IMAP_for_Inboxes