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Ballot SMC05: Adoption of CAA for S/MIME

The Intellectual Property Review (IPR) period for Ballot SMC05 (Adoption of CAA for S/MIME) has completed. No IPR Exclusion Notices were filed, and the ballot is adopted as of February 20, 2024.

The new S/MIME BR v.1.0.3 have been published to the CABF public website in accordance with the Bylaws:

Notice of Review Period SMC05: Adoption of CAA for S/MIME

This Review Notice is sent pursuant to Section 4.1 of the CA/Browser Forum’s Intellectual Property Rights Policy (v1.3). This 30-day Review Period is for the Final Maintenance Guideline that is attached to this Review Notice.

Ballot for Review: Ballot SMC05, redline at Start of Review Period: January 17, 2024 End of Review Period: 2359 UTC on February 16, 2024 Please forward a written notice to exclude Essential Claims by email to and a copy to the CA/B Forum public mailing list before the end of the Review Period.

See current version of CA/Browser Forum Intellectual Property Rights Policy for details. See also An optional format for an Exclusion Notice is available at

Voting Results

The voting period for Ballot SMC05: Adoption of CAA for S/MIME has completed, and the ballot has passed.

Certificate Issuers

19 votes total, with no abstentions:

  • 19 Issuers voting YES: Actalis S.p.A., Asseco Data Systems SA (Certum), Chunghwa Telecom, DigiCert, D-TRUST, eMudhra, Entrust, GDCA, GlobalSign, HARICA, IdenTrust, OISTE Foundation, SECOM Trust Systems, Sectigo,, SwissSign, Telia Company, VikingCloud, Visa
  • 0 Issuers voting NO
  • 0 Issuers ABSTAIN

Certificate Consumers

3 votes total, with no abstentions:

  • 3 Consumers voting YES: Apple, Mozilla, rundQuadrat
  • 0 Consumers voting NO
  • 0 Consumers ABSTAIN

100% of voting Certificate Consumers voted in favor

Bylaws Requirements

  1. Bylaw 2.3(f) requires:
    1. A “yes” vote by two-thirds of Certificate Issuer votes and by 50%-plus-one of Certificate Consumer votes. Votes to abstain are not counted for this purpose. This requirement was MET for Certificate Issuers and MET for Certificate Consumers.
    2. At least one Certificate Issuer and one Certificate Consumer Member must vote in favor of a ballot for the ballot to be adopted. This requirement was MET.
  2. Bylaw 2.3(g) requires that a ballot result only be considered valid when “more than half of the number of currently active Members has participated”. The number of currently active Voting Members is the average number of Voting Member organizations that have participated in the previous three meetings. Votes to abstain are counted in determining quorum. The quorum was 10 for this ballot. This requirement was MET.

This ballot now enters the 30-day IP Rights Review Period to permit members to review the ballot for relevant IP rights issues. The IP Rights Review Period ends at 1700 UTC on December 8, 2023.

Ballot SMC05: Adoption of CAA for S/MIME

Purpose of Ballot:

The ballot proposes changes to the S/MIME Baseline Requirements to introduce the use of Certification Authority Authorization (CAA) Processing for Email Addresses as defined in RFC 9495. It also includes minor typographic corrections.

The following motion has been proposed by Corey Bonnell of DigiCert and endorsed by Dimitris Zacharopoulos of HARICA and Ben Wilson of Mozilla.

Motion begins

This ballot modifies Version 1.0.2 of the “Baseline Requirements for the Issuance and Management of Publicly-Trusted S/MIME Certificates” (“S/MIME Baseline Requirements”) resulting in Version 1.0.3.

The proposed modifications to the S/MIME Baseline Requirements may be found at

The SMCWG Chair or Vice-Chair is permitted to update the Relevant Dates and Version Number of the S/MIME Baseline Requirements to reflect final dates.

Motion ends

This ballot proposes a Final Maintenance Guideline. The procedure for approval of this ballot is as follows:

Discussion (7 days)

  • Start Time: Wednesday January 3, 2024 18:00 UTC
  • End Time: Wednesday January 10, 2024 23:30 UTC

Vote for approval (7 days)

  • Start Time: January 10, 2024 23:30 UTC
  • End Time: January 17, 2024 23:30 UTC
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