Bug#1058808: exim4: Consider including Authenticated Received Chain (ARC) support in Debian packages

[Athanasius]

Package: exim4
Version: 4.96-15+deb12u3
Severity: wishlist

Dear Maintainer,

  Given Google's recommendation of using ARC[1] when forwarding emails,
could activation of `EXPERIMENTAL_ARC` support in the Debian packages be
considered ?

  The email server I run has a number of aliases and user-mediated
(procmail etc) forwarding of email to GMail accounts.  Obviously this
breaks DMARC/SPF/DKIM checks if no attempt at mitigation is made.

  I could find no mention of `EXPERIMENTAL_ARC` within the `debian/`
directory of sid 4.97-2 exim4 sources.

[1] - https://support.google.com/mail/answer/81126#zippy=%2Crequirements-for-all-senders

-- Package-specific info:
Exim version 4.96 #2 built 18-Nov-2023 10:07:57
Copyright (c) University of Cambridge, 1995 - 2018
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2022
Berkeley DB: Berkeley DB 5.3.28: (September  9, 2013)
Support for: crypteq iconv() IPv6 PAM Perl Expand_dlfunc GnuTLS TLS_resume move_frozen_messages Content_Scanning DANE DKIM DNSSEC Event I18N OCSP PIPECONNECT PRDR PROXY Queue_Ramp SOCKS SPF SRS TCP_Fast_Open
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz dbmnz dnsdb dsearch ldap ldapdn ldapm mysql nis nis0 passwd pgsql sqlite
Authenticators: cram_md5 cyrus_sasl dovecot external plaintext spa tls
Routers: accept dnslookup ipliteral iplookup manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Malware: f-protd f-prot6d drweb fsecure sophie clamd avast sock cmdline
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
Configuration file search path is /etc/exim4/exim4.conf:/var/lib/exim4/config.autogenerated
Configuration file is /etc/exim4/exim4.conf

-- System Information:
Debian Release: 12.4
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.63-fysh-kvmguest (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages exim4 depends on:
ii  debconf [debconf-2.0]  1.5.82
ii  exim4-base             4.96-15+deb12u3
ii  exim4-daemon-heavy     4.96-15+deb12u3

exim4 recommends no packages.

exim4 suggests no packages.

-- debconf-show failed

-- 
- Athanasius (he/him) = Athanasius(at)miggy.org / https://miggy.org/
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