Greetings,

I am writing to you as a reminder regarding future compliance of S/MIME 
certificates with the multi-purpose and strict profiles established by the 
CA/B Forum. As noted before, the Mozilla Root Store Policy incorporates the 
CA/B Forum's S/MIME Baseline Requirements (S/MIME BRs). The initial 
adoption of the S/MIME BRs included a commitment to eliminate the Legacy 
Generation Certificate Profile for those S/MIME certificates issued under 
Publicly-Trusted CAs. This post is just to alert you that the S/MIME 
Certificate Working Group will phase out the Legacy certificate profile as 
of July 15, 2025. Of note, the maximum validity period for S/MIME 
certificates will go from 1185 days to 825 days. 

Here is the proposed ballot for the phasing out of legacy S/MIME 
certificates: Draft Ballot SMC-008 
<https://groups.google.com/a/groups.cabforum.org/g/smcwg-public/c/25fjG3FyiF0>
.

It is crucial to note that S/MIME certificates not complying with these 
profiles will be found non-compliant with Mozilla's policy. If you have not 
been paying close attention to these changes, I urge you to review them 
thoroughly to ensure future compliance.

Thank you for your attention to this matter.
Ben

On Wednesday, June 5, 2024 at 9:54:19 AM UTC-6 Ben Wilson wrote:

> All,
>
> The Mozilla Root Store Policy incorporates the CA/B Forum's S/MIME 
> Baseline Requirements 
> <https://cabforum.org/working-groups/smime/requirements/> (BRs). The 
> initial adoption of S/MIME BRs included a commitment to eliminate the Legacy 
> Generation Certificate Profile for those S/MIME certificates issued under 
> Publicly-Trusted CAs. This post is just to alert you that the S/MIME 
> Certificate Working Group will phase out the Legacy certificate profile, as 
> of June 15, 2025. See Draft Ballot SMC-008 
> <https://github.com/srdavidson/smime/tree/Ballot-SMC08>. One change will 
> be to reduce the maximum validity period for S/MIME certificates from 1185 
> days to 825 days. (The S/MIME BRs have a Multipurpose Generation 
> certificate profile that may serve most needs when the Legacy certificate 
> profile is gone.)
>
> Are there any questions, comments, or concerns before this goes to ballot 
> in the next few weeks?
>
> Thanks,
>
> Ben
>
>
>

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