Exim 4.100 Release Candidate 1 is now available for testing, featuring significant updates such as native support for email authentication protocols (SPF, DKIM, DMARC) and dynamic loadable modules. This release also addresses four confirmed security vulnerabilities, enhancing the software's overall security posture while removing long-deprecated options and requiring operators to audit their configurations. Performance improvements reflect the demands of modern hardware, and the software has undergone broad hardening patches since the previous version. The stable release will be finalized after the testing period, but the current stable version remains at 4.99.5 until then

Exim 4.100 Release Candidate 1 Available for Testing

Exim 4.100-RC1 has arrived in the official testing directory. The release stays firmly within the 4.x line, but two decades of incremental development have finally been packaged under a century mark, bringing native SPF/DKIM/DMARC authentication, dynamic loadable modules, and expanded taint tracking to the long-lived codebase. Operators should audit their configurations against removed legacy drivers and patched log formats, as 4.100-RC1 also closes four confirmed CVEs including a musl-specific DNS crash and a JSON heap corruption flaw. The release candidate is available now for review, though the stable 4.99.5 build remains the production default until the RC testing period concludes.

Exim 4.100 Release Candidate 1 Available for Testing @ Linux Compatible