[FFe] [24.04 FEAT] Allow dmarc features on spamassassin

[Miriam España Acebal]

Feature Freeze Exception (FFe):
-------------------------------

To avoid a component mismatched issue, libmail-dmarc-perl was demoted to Suggested from Recommends in spamassassin version 4.0.0-7ubuntu1 on mantic.

A MIR process has been carried out to promote libmail-dmarc-perl to main (LP:2023971), which has been ack recently. I reproduce the rationale we gave there:

   tldr; DMARC support in SpamAssassin is important for stronger spam filtering.

   Spam email is an ever-present and ever-evolving presence in our online lives, and SpamAssassin is a key
   tool for end users and service providers to identify likely spam for filtering. SpamAssassin 4.0,
   introduced in Ubuntu "lunar" 22.10, introduced a number of major new features including three new
   plugins, the most significant of which is the DMARC policy checker.

   DMARC (or "Domain-based Message Authentication, Reporting & Conformance" https://dmarc.org/) is a new
   convention for email service providers to communicate to email recipient programs about how to handle
   authentication failures. It builds on prior protocols (namely, SPF and DKIM) to address their
   limitations. Essentially, DMARC protects against direct domain spoofing, such that when an email
   purports to be from a given domain (say, @gmail.com or @irs.gov) but fails proper authentication using
   the authentication methods published by that domain, it tells the email receiver whether to reject the
   email as spam, quarantine it for evaluation, or something else. DMARC also establishes a way for the
   email receiver to give feedback back to the sender about emails that failed to pass this check.

   libmail-dmarc-perl contains the official Perl implementation of DMARC support. SpamAssassin is the
   primary user of this package

The new package should not break any other packages that depend on it. In the MIR bug for dmarc, the use of this feature with spamassassin has been tested [1] and dep-8 tests has been added to libmail-dmarc-perl too.

Installation of the spamassassin package with dmarc to be promoted has been tested at [2].

The 'ubuntu-release' team could finally be subscribed to allow the promotion.

[1] https://bugs.launchpad.net/ubuntu/+source/libmail-dmarc-perl/+bug/2023971/comments/26
[2] https://bugs.launchpad.net/ubuntu/+source/libmail-dmarc-perl/+bug/2023971/comments/29

---------

Move back libmail-dmarc-perl as a Recommends dependency from Suggested.

[Paride Legovini (paride)]

The rationale is solid, the MIR was indeed approved by the MIR team and by security. As stated in in the FFe request, the FFe is only about moving back libmail-dmarc-perl from Suggests to Recommends.

The FFe is granted.

[Launchpad Janitor (janitor)]

This bug was fixed in the package spamassassin - 4.0.0-8ubuntu5

---------------
spamassassin (4.0.0-8ubuntu5) noble; urgency=medium

  * d/control: Revert demotion on version 4.0.0-7ubuntu1 for
    libmail-dmarc-perl as result of being ACKed for promotion to
    main (see LP #2023971).
    (LP: #2061379)

 -- Miriam España Acebal <email address hidden> Fri, 12 Apr 2024 14:53:49 +0200