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Introduction to exim

Exim is a message transfer 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.

The major features are summarised below. There is also an overview which expands on these features. Exim has an extensive set of documentation included in the exim specification, additionally there are documents on the filtering functionality and other documentation is being made available on this web site. The full overview is also available.

Basic Features

Incoming SMTP

Outgoing SMTP

Local Deliveries

Monitoring and Performance Tools

SPAM/UCE/UBE Limitation Features

Limitations


Nigel Metheringham

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