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Exim

Message transfer agent (MTA) for Unix systems.

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Exim is a message transfer agent (MTA) for Unix systems connected to the Internet, originally developed at the University of Cambridge. It handles the routing and delivery of email, with flexibility in how mail is routed and extensive facilities for checking incoming mail. It can be installed in place of Sendmail, though its configuration differs.

Exim is freely available under the GNU General Public Licence. The current version is 4.100, with maintenance releases published mainly for package maintainers; beta versions may be available in Testing directories. Versions prior to 4.100 are obsolete, including the 3.x series. Security advisories and CVE disclosures are published for the project. Documentation, mailing lists, a wiki, and bug tracking are available alongside the download.

12 alternatives to Exim

Ranked by how well each tool replaces Exim: shared features, audience, price and popularity.

  1. Postfix

    A mail server intended as an alternative to Sendmail

    Covers 2 of 15 key features.

    Open source
    56 out of 100 match—

  2. iRedMail

    Free, Open Source Mail Server Solution

    Covers 4 of 15 key features and has a free plan.

    Free planOpen source
    55 out of 100 matchFree

  3. ImprovMX

    Forward emails easily.

    Covers 1 of 15 key features and has a free plan.

    Free plan
    54 out of 100 match$4.17/mo

  4. AgentMail

    Email inbox API for AI agents.

    Covers 3 of 15 key features and has a free plan.

    Free plan
    53 out of 100 match$20/mo

  5. amavisd-new

    High-performance interface between MTA and content checkers

    Covers 3 of 15 key features.

    Open source
    53 out of 100 matchFree

  6. MailerQ

    A high performance Mail Transfer Agent (MTA)

    Covers 0 of 15 key features.

    52 out of 100 match—

  7. PostageApp

    The easier way to send email from web apps.

    Covers 1 of 15 key features.

    51 out of 100 match—

  8. HylaFAX

    Enterprise-class system for sending and receiving facsimiles and alpha-numeric pages on

    Covers 3 of 15 key features.

    Open source
    49 out of 100 match—

  9. MailGuard

    Email Security for Australian Businesses.

    Covers 5 of 15 key features.

    48 out of 100 match—

  10. Bird (formerly MessageBird, includes SparkPost)

    Email API for developers: send and receive email from your app or agent

    Covers 1 of 15 key features and has a free plan.

    Free plan
    48 out of 100 match$15/mo

  11. Sendio

    Sendio — Eliminate Email Cyber Threats – Total inbox control and email security.

    Covers 1 of 15 key features.

    48 out of 100 match$3.40/mo

  12. MTARGET

    Email API & Email Marketing Platform

    Covers 1 of 15 key features and has a free plan.

    Free plan
    47 out of 100 matchFree