Security & IT

Exim Internet Mailer

Open source mail transfer software for use on Unix systems connected to the Internet.

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Overview

Exim Internet Mailer transfers messages on Unix systems connected to the Internet. Its routing is flexible, with extensive ways to check incoming mail. Exim Internet Mailer is freely available under the GNU General Public Licence. The specification provides the details needed to install, configure and use it.

Updated Nov 12, 2026

4 things

What Exim Internet Mailer has

For developers

Source code is publicly available for anyone to inspect, modify, or self-host.

Extras

A collection of answers to common questions about using a product. One of 6 Security & IT tools with FAQ.
An educational resource that explains a topic and helps readers build their knowledge. One of 5 Security & IT tools with guide.
Instructions that explain how to use a product.

3 features

Key Features

Message transfer agent
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Flexible mail routing
There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail.
Sendmail replacement
Exim can be installed in place of Sendmail , although the configuration of Exim is quite different.

Pros and cons

Pros

Mail routing is flexible, with extensive facilities for checking incoming mail.

You?

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5 questions

FAQs

What does Exim Internet Mailer do?

Exim Internet Mailer transfers messages as a message transfer agent on Unix systems connected to the Internet.

Is Exim Internet Mailer open source?

Yes. Exim Internet Mailer is freely available under the terms of the GNU General Public Licence.

What systems is Exim Internet Mailer for?

Exim Internet Mailer is developed for use on Unix systems connected to the Internet.

Does Exim Internet Mailer have a user manual?

Yes. The Exim Specification is the main user and configuration manual, with details for installation, configuration and use.

Does Exim Internet Mailer have an FAQ?

Yes. A wiki FAQ covers Exim 4, while the FAQ for the obsolete Exim 3 releases is available separately.

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4 things

What Exim Internet Mailer has

For developers

Source code is publicly available for anyone to inspect, modify, or self-host.

Extras

A collection of answers to common questions about using a product. One of 6 Security & IT tools with FAQ.
An educational resource that explains a topic and helps readers build their knowledge. One of 5 Security & IT tools with guide.
Instructions that explain how to use a product.

3 features

Key Features

Message transfer agent
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
Flexible mail routing
There is a great deal of flexibility in the way mail can be routed, and there are extensive facilities for checking incoming mail.
Sendmail replacement
Exim can be installed in place of Sendmail , although the configuration of Exim is quite different.

Pros and cons

Pros

Mail routing is flexible, with extensive facilities for checking incoming mail.

You?

Be the first to rate Exim Internet Mailer

Your review helps others make better decisions. No account needed. Takes about 10 seconds.

5 questions

FAQs

What does Exim Internet Mailer do?

Exim Internet Mailer transfers messages as a message transfer agent on Unix systems connected to the Internet.

Is Exim Internet Mailer open source?

Yes. Exim Internet Mailer is freely available under the terms of the GNU General Public Licence.

What systems is Exim Internet Mailer for?

Exim Internet Mailer is developed for use on Unix systems connected to the Internet.

Does Exim Internet Mailer have a user manual?

Yes. The Exim Specification is the main user and configuration manual, with details for installation, configuration and use.

Does Exim Internet Mailer have an FAQ?

Yes. A wiki FAQ covers Exim 4, while the FAQ for the obsolete Exim 3 releases is available separately.

Exim Internet Mailer

Overview

What Exim Internet Mailer has

For developers

Extras

Key Features

Message transfer agent

Flexible mail routing

Sendmail replacement

Pros and cons

Pros

Be the first to rate Exim Internet Mailer

FAQs

What does Exim Internet Mailer do?

Is Exim Internet Mailer open source?

What systems is Exim Internet Mailer for?

Does Exim Internet Mailer have a user manual?

Does Exim Internet Mailer have an FAQ?

What Exim Internet Mailer has

For developers

Extras

Key Features

Message transfer agent

Flexible mail routing

Sendmail replacement

Pros and cons

Pros

Be the first to rate Exim Internet Mailer

FAQs

What does Exim Internet Mailer do?

Is Exim Internet Mailer open source?

What systems is Exim Internet Mailer for?

Does Exim Internet Mailer have a user manual?

Does Exim Internet Mailer have an FAQ?

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