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Exim Internet Mailer

Documentation for Exim

Exim has a set of documentation released with it. A text file of the main documentation is released as part of the Exim tar archive. Additionally, postscript and texinfo forms of the documentation are available in separate tar archives on the ftp sites. There is also a book.

New user documentation can be found at the Exim New Users site

User supported documentation, FAQs and hints can be found in the wiki.

There are 3 main sets of documentation for Exim, all of which are also available below in html form.

The main user and configuration manual is the specification document

The Exim Specification - Version 4.72 (PDF) - The master documentation for Exim containing all required detail to install, configure and use Exim. Changes to the documentation (normally reflecting changes to the functionality of Exim) are shown on a green background like this segment.

The Exim Filter Specification - Version 4.72 (PDF) - Additional information on the Exim filter language.

HOWTO Documentation

Frequently Asked Questions - FAQ

The wikified FAQ for Exim 4 can be found here. The FAQ for the obsolete Exim 3 releases can be found on the FTP site - see the download pages.

Copies of Documentation

Copies of the main Exim documentation in HTML format as used on this site in a compressed tar file are available from the main ftp site and mirrors (see file exim-html-*).

Exim Filter Specification - Table of Contents

The Exim Mail Transport Agent

This document was generated on 2 April 1998 using the texi2html translator version 1.52.

Exim Filter Specification - Exim's User interface to mail filtering Go to the first, previous, next, last section, table of contents.

1 Exim's User interface to mail filtering

Exim is a mail transfer agent for Unix systems. This document describes the user interface to its in-built mail filtering facility, and is copyright (c) University of Cambridge 1998. -------------------------------------------------------------------------

Go to the first, previous, next, last section, table of contents. Exim Filter Specification - Significant deliveries Go to the first, previous, next, last section, table of contents.

1.9 Significant deliveries

When in the course of delivery a message is processed by a filter file, what happens next, that is, after the whole filter file has been processed, depends on whether the filter has set up any significant deliveries or not. If there is at least one significant delivery, then the filter is considered to have handled the entire delivery arrangements for the current address, and no further processing of the address takes place. If, however, no significant deliveries have been set up, Exim continues processing the current address as if there were no filter file, and typically sets up a delivery of a copy of the message into a local mailbox. In particular, this happens in the special case of a filter file containing only comments.

The delivery commands `deliver', `save', and `pipe' are by default significant. However, if such a command is preceded by the word "unseen", then its delivery is not considered to be significant. In contrast, other commands such as "mail" and "vacation" do not count as significant deliveries unless preceded by the word "seen".

Go to the first, previous, next, last section, table of contents. Exim Filter Specification - Filter commands Go to the first, previous, next, last section, table of contents.

1.10 Filter commands

The filter commands which are described in subsequent setions are listed below, with the section in which they are described in brackets: 



`add'              increment a user variable ("The add command")

`deliver'          deliver to an email address ("The deliver command")
`finish'           end processing ("Other commands")
`if'               test condition(s) ("Obeying commands conditionally")
`logfile'          define log file ("Logging commands")

`logwrite'         write to log file ("Logging commands")

`mail'             send a reply message ("Mail commands")
`pipe'             pipe to a command ("The pipe command")
`save'             save to a file ("The save command")
`testprint'        print while testing ("Other commands")
`vacation'         tailored form of `mail' ("Mail commands")

In addition, when Exim's filtering facilities are being used as a system filter, the `fail', `freeze', and `headers' commands are available. However, since they are usable only by the system administrator and not by ordinary users, they are described in the main Exim specification rather than in this document.

Go to the first, previous, next, last section, table of contents. Exim Filter Specification - The add command Go to the first, previous, next, last section, table of contents.

Go to the first, previous, next, last section, table of contents.

1.2 Testing a new filter file

Filter files, especially the more complicated ones, should always be tested, as it is easy to make mistakes. Exim provides a facility for preliminary testing of a filter file before installing it. This tests the syntax of the file and its basic operation, and can also be used with ordinary `.forward' Exim Overview

The Exim Mail Transport Agent

Table of Contents

Exim Overview

Date: 10 July 1997

Exim is a mail transport agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It is freely available under the terms of the GNU General Public Licence. In style it is similar to Smail 3, but its facilities are more extensive, and in particular it has some defences against mail bombs and unsolicited junk mail, in the form of options for refusing messages from particular hosts, networks, or senders.

Exim is in production use on a num