Exim is a mail transfer agent with an unusually flexible configuration model. It was originally developed at the University of Cambridge and is designed for Unix-like operating systems including Linux.
The software separates message routing from delivery using routers and transports. This makes it possible to construct anything from a straightforward Internet mail server to complex installations with multiple domains, unusual routing requirements and external data sources.
A major strength is its policy control. Administrators can apply access control lists at different stages of an SMTP transaction, allowing decisions to be based on senders, recipients, hosts, authentication state and other message properties.
This is free and open source software.
Key Features
- Flexible message routing using configurable routers and transports.
- Detailed access control lists for applying policy during SMTP sessions.
- SMTP authentication and encrypted connections using TLS.
- IPv6 support.
- Built-in Exim filtering as well as Sieve filtering.
- Address rewriting and alias handling.
- Interfaces for integrating spam and malware scanning.
- Extensive logging and configurable retry handling.
- Support for virtual domains and complex mail-routing arrangements.
- Designed to handle both small installations and large Internet-facing mail systems.
Website: www.exim.org
Support:
Developer: The Exim Maintainers
License: GNU General Public License v2.0
Exim is written in C. Learn C with our recommended free books and free tutorials.
Related Software
| Email Servers | |
|---|---|
| Exim | Highly configurable mail transfer agent |
| OpenSMTPD | Implementation of the server-side SMTP protocol with additional extensions |
| mox | Modern, secure, all-in-one email server |
| DBMail | Enables storing and retrieving mail messages from a database |
| WildDuck | Opinionated email server |
| Stalwart | All-in-one mail and collaboration server |
| Mailu | Self-hosted mail server stack |
| Mail-in-a-Box | Self-hosted email server solution |
| Postfix | Popular mail transfer agent |
| Maddy | Composable all-in-one mail server |
| Haraka | Modern SMTP server |
| Dovecot | Secure POP3 server that supports mbox and maildir mailboxes |
| Courier | Integrated mail/groupware server |
| Cyrus IMAP | Email, contacts and calendar server |
| Zimbra | Zimbra Collaboration Suite |
| Modoboa | Mail hosting and management platform |
| Citadel | Exchange-killer groupware server |
| chasquid | SMTP server with a focus on simplicity, security, and ease of operation |
| Sendmail | Mail transfer agent for sophisticated mail configurations |
| qmail | Written as a more secure replacement for the Sendmail program |
| dma | DragonFly Mail Agent |
| DavMail | POP/IMAP/SMTP/Caldav/Carddav/LDAP exchange gateway |
Read our verdict in the software roundup.
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