#1146647 exim4: TLS error: The TLS connection was non-properly terminated.

Package:
exim4
Source:
exim4
Submitter:
Timo van Roermund
Date:
2026-09-04 07:11:02 UTC
Severity:
normal
#1146647#5
Date:
2026-09-04 07:08:59 UTC
From:
To:
Dear Maintainer,

The following error occurs multiple times in the exim logs:

    TLS error on connection from maile-da.linkedin.com [108.174.6.201] (recv): The TLS connection was non-properly terminated.

The reason seems to be that several servers from major service providers (including LinkedIn, Google) intentionally omit close_notify to save a roundtrip, despite it being against the TLS protocol.

It's a known issue, reported long time ago to the exim project. See: https://github.com/Exim/exim/pull/94. And the changelog for the Debian exim4 package suggests that a patch for this issue was cherrypicked in version 4.99-1:

  * Cherrypick patch to avoid logging error on seeing TCP-drop after sending
    QUIT. (https://code.exim.org/exim/exim/issues/3121)

If so, why am I still seeing these errors?

Chers,

Timo