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hMailServer Community Forum
hMailServer 6.3.3 — signed 15 September 2026, Windows and Linux, database schema 6040, and a drop-in upgrade from any 5.x install.Download 6.3.3 Documentation
  1. Support and discussion for hMailServer
  2. Development & roadmap
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  4. hMailServer 6.0.0-B4: fixes the startup crash from the bundled VC++ runtime

hMailServer 6.0.0-B4: fixes the startup crash from the bundled VC++ runtime

Scheduled Pinned Locked Moved Pre-release builds
prereleasebugfixwindowsinstaller
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    Progressiverobot
    hMailServer Team
    wrote on last edited by
    #1

    This was a beta build of the 6.0 line. 6.0.0 was the production release. Nothing here should be installed today.

    Build 3 shipped VC++ runtime DLLs that did not match the toolset the binaries were built with, and the service crashed at startup on fresh installs. This build corrects the installer payload.

    The detail: hMailServer.exe is built with v145 (14.51), but build 3 bundled VS2019-era (14.25) VC++ runtime DLLs app-local in Bin\. Those app-local copies were loaded instead of the system runtimes, and the service died at startup with 0xC0000005 in msvcp140!mtx_do_lock, reached via boost regex and std::mutex. Fresh installs were the ones affected.

    Changes in this build:

    • The installer now ships Microsoft.VC145.CRT (14.51.36231), matching the build toolset. The stale Microsoft.VC142.CRT payload has been removed.
    • The bundled 2015-era UCRT has been removed. It has been in-box since Server 2016 and Windows 10.
    • build/run-tests.ps1: fixed a stdout/stderr pipe deadlock in the test runner.

    The full regression gate ran against MariaDB on the MYSQL backend: 898 of 898 passed.

    Full release notes, checksums and signatures

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