Exim maintenance release 4.93.0.4 | branch exim-4.93+fixes

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Hi,

today we published a maintenance release 4.93.0.4.
A short list of changes since 4.93 is attached.

This current update mainly addresses SPF issues that came up recently,
since the previous maintenance release.

If your Exim installation runs fine, there is no need to install this
maintenance release, and you may stop reading.

----

The recent release 4.93 seems to have issues on some platforms or in
some environments.

We forked a new branch exim-4.93+fixes off exim-4.93.

This branch is mainly for package maintainers and contains proposed
updates to avoid issues in a broad range of platforms and environments.

* These maintenance releases do not experience the same test cycle as
  the major releases.

For selected points in the +fixes branch we create Git tags and publish
tarballs on https://ftp.exim.org/pub/exim/exim4/fixes/.  The tarballs
are based on the tagged commits of the exim-4.94+fixes branch of our Git
repo https://git.exim.org/exim.git

The tag and tarballs are signed with the same key as I use to sign this
announcement.

    Best regards from Dresden/Germany
    Viele Gr=C3=BC=C3=9Fe aus Dresden
    Heiko Schlittermann
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bf4d78378  (tag: exim-4.93.0.4) SPF: fix handling mix of spf and other txt records.  Bug 2499
db78a5c40  Fix the variables set by gsasl authenticator
53afb7482  Fix build with heimdal-gssapi.  Bug 2501
f7be88fdc  Eximon: fix string-handling.  Bug 2500
1bfc75b19  SPF: only require "v=spf1" on TXT DNS records during lookups.  Bug 2499
0445bf504  ARC: Reset received ARC instance counter before next message on a connection.  Bug 2498
b5927f59b  Testsuite: account for 4-component version numbers
a0f5040c4  Zero smtp context structure after allocation
134c037ed  DMARC: default dmarc_tld_file to unset.  Bug 2494
2529a7a64  (tag: exim-4.93.0.3) Fix taint issue with retry records.  Bug 2492
92a158a6b  (tag: exim-4.93.0.2) ARC: fix crash induced by misordered headers.  Bug 2493
5169b5fa9  Fix taint issue in transport with DSN.  Bug 2491
8ab104034  (tag: exim-4.93.0.1) local_scan: align local_scan.h and docs re. store_get()
c97d37d24  Docs: Add missing DMARC ACL control= entry
6397b2926  Hurd: errno really uses more than a short-sized value.  Bug 2476
0582221c4  TFO: disable for FreeBSD
5cb18fca8  Regard command-line recipients as tainted
00b35aee4  PAM: fix crash in the pam expansion condition.  Bug 2489

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