Knowledge Base

New Certificate Profile Requirements for Public Secure Email (S/MIME) Certificates 2025

Solution ID : ALERT34

Last Modified : 04/11/2025

End of Life for the Legacy certificate profile

Important: This is a dynamic article. We will update it as new information becomes available. Save this page and check back periodically for the latest information.

The S/MIME Baseline Requirements currently support three certificate profiles for Secure Email (S/MIME) certificates: Strict, Multipurpose, and Legacy. The baseline requirements refer to these as generation profiles. However, according to the latest S/MIME Baseline Requirements, the industry will end of life the Legacy Generation profile in July 2025. For more information about this industry change, see section 1.2.1 Revisions in the latest S/MIME Baseline Requirements.

To learn more about what DigiCert® is doing to meet this new industry requirement, see DigiCert’s timeline for sunsetting the Legacy profile below.

Certificate profile comparison

Generation profile	Maximum certificate validity¹	Supported Key Usage	Supported Extended Key Usage (EKU)	Requirements specific to sponsor-validated certificates
Strict	825 days	Digital Signature Key Encipherment Non-Repudiation	Secure Email	Must include the recipient's first and last name or pseudonym in the subject of the certificate.
Multipurpose	825 days	Digital Signature Key Encipherment Non-Repudiation Data Encipherment²	Secure Email Client Authentication³	Must include the recipient's first and last name or pseudonym in the subject of the certificate.
Legacy	1185 days	Digital Signature Key Encipherment Non-Repudiation Data Encipherment²	Secure Email Client Authentication³	(Optional) May include the recipient's first and last name or pseudonym in the subject of the certificate. For the Legacy certificate profile adding this information is optional.
¹ DigiCert's maximum certificate validity for Multipurpose and Strict profiles is 824 days and 1184 days for the Legacy profile to avoid exceeding the maximum allowed limit ²Data encipherment allows you to use the certificate to sign documents. ³Client authentication allows you to use the certificate as your Digital ID to authenticate to a server or remote computer.

DigiCert’s timeline for sunsetting the Legacy Generation profile

DigiCert's timeline ensures we update our S/MIME certificate issuance process to remove support for the Legacy certificate profile and stop issuing S/MIME certificates using it before the timeline specified in the S/MIME Baseline Requirements.

July 1, 2025: Stop accepting new S/MIME certificate requests using the Legacy certificate profile
On July 1, 2025, at 11:00 MDT (17:00 UTC), DigiCert will no longer accept S/MIME certificate requests using the Legacy certificate profile. All new S/MIME certificate requests must use the Strict or Multipurpose certificate profile. This change affects new, renewed, and reissued certificate requests.
July 8, 2025: Stop issuing S/MIME certificates using the Legacy certificate profile
On July 8, 2025, at 11:00 MDT (17:00 UTC), DigiCert will stop issuing S/MIME certificates using the Legacy certificate profile.

How does the new certificate profile requirement affect my public S/MIME certificates?

Existing S/MIME certificates using the Legacy certificate profile
Your existing S/MIME certificates issued with the Legacy certificate profile are not affected by the new certificate profile requirement. You can continue to use these certificates until they expire.
However, starting July 1, 2025, if you reissue or when you renew S/MIME certificates with the Legacy profile, you must use the Strict or Multipurpose profile instead.
New S/MIME certificate requests starting July 1, 2025
On July 1, 2025, we will change the default certificate profile from Legacy to either Strict or Multipurpose. See the Profile mappings table below.

Profile mappings

Product	Certificate profiles before July 1, 2025	Certificate profiles starting July 1, 2025
Secure Email for Individual Secure Email for Business Secure Email for Organization	Legacy (default) Strict Multipurpose	Strict (default)⁴ Multipurpose
Email Security Plus Digital Signature Plus Premium Class 1 S/MIME	Legacy	Multipurpose
⁴In CertCentral®, on the Product Settings page, administrators can change the default certificate profile to Multipurpose, if needed.

What can I do?

Order S/MIME certificates with the Legacy certificate profile before July 1, 2025.
To get a sponsor-validate S/MIME certificate with the recipient’s email address as the common name without the subject individual’s first and last name or pseudonym, you must order your S/MIME certificates with the Legacy certificate profile before July 1, 2025. See the Requirements specific to sponsor-validated certificates column in the Certificate profile comparison table above.
Prepare your S/MIME certificate process to align with the new certificate profile requirement
Ultimately, the most important thing you can do is update your S/MIME certificate issuance to make sure it aligns with the new requirement and continues to work the way it did before July 1, 2025. See Platform-specific changes below.

Platform-specific changes

Learn more about the changes coming to your platform and what you need to do to prepare for the new certificate profile requirement for S/MIME certificate issuance coming July 1, 2025, at 11:00 MDT (17:00 UTC):

CertCentral: Updates to the S/MIME certificate process
CertCentral Services API: Updates to S/MIME Endpoint Integrations
Trust Lifecycle Manager: Updates to the S/MIME certificate process

CertCentral: Updates to the S/MIME certificate process

Secure Email Products

Secure Email Certificate products already support Strict, Multipurpose, and Legacy certificate profiles. On July 1, 2025, we will remove the Legacy profile from the Profile options menu on all request forms. You must use the Strict or Multipurpose profile when ordering, reissuing, or renewing Secure Email certificates.

Secure Email for Individual | Mailbox validated
Secure Email for Business | Sponsor validated
Secure Email for Organization | Organization validated

To learn more about DigiCert’s Secure Email Certificate products, see Secure Email Certificates.

Old S/MIME Products

Old S/MIME certificate products use the Legacy certificate profile and currently do not support the Strict or Multipurpose profiles. On July 1, 2025, DigiCert will remove these products from CertCentral. You can no longer order or renew old S/MIME certificates in CertCentral; you must request a Secure Email Certificate instead.

However, you can still order these certificates through service API until we deprecate them in early 2026. Starting July 1, 2025, we will use the Multipurpose certificate profile to issue these certificates. So, do not procrastinate updating your API integrations with the new Secure Email Certificate products.

Email Security Plus | Sponsor validated
Digital Signature Plus | Sponsor validated
Premium | Sponsor validated
Class 1 S/MIME | Mailbox validated

Product and Certificate Profile Mapping

Product and enrollment method		Before July 1, 2025	After July 1, 2025
Secure Email for Individual Secure Email for Business Secure Email for Organization	Enroll through CertCentral	Legacy (default) Multipurpose Strict	Multipurpose Strict (default)⁵
	Enroll through Service API	Legacy (default) Multipurpose Strict	Multipurpose Strict (default)⁵
Email Security Plus Digital Signature Plus Premium Class 1 S/MIME	Enroll through CertCentral	Legacy	End of Life
	Enroll through Service API⁶	Legacy	Multipurpose
⁵ In CertCentral, on the Product Settings page, administrators can change the default certificate profile to Multipurpose, if needed. ⁶We will deprecate the API workflow for old S/MIME certificates in early 2026.

Pending S/MIME certificate orders using the Legacy profile

On July 1, 2025, DigiCert will stop accepting the S/MIME certificate requests with the Legacy certificate profile. On July 8, 2025, DigiCert will stop issuing pending S/MIME certificates using the Legacy certificate profile. If you still need the S/MIME certificate, cancel the pending order and order a new certificate using the Strict or Multipurpose certificate profile.

Reissuing S/MIME certificates issued with the Legacy certificate profile after July 1, 2025

If the primary certificate’s remaining validity is greater than the 824-day maximum validity allowed by the Strict and Multipurpose profiles, we will truncate your reissue without a refund.

Additional requirements for Sponsor validated products

When you order/reissue/renew the sponsor validated certificates with the email address as the common name, additional information is required based on the certificate profile.

For the Legacy profile, no other information is required when using the recipient’s email address as the common name.
For the Strict and Multipurpose profiles, you must add the recipient’s first and last name or pseudonym when using the recipient’s email address as the common name.

Requirements for CertCentral

Product	Certificate profile	Common name	Additional requirements
Secure Email for Business Email Security Plus⁷ Digital Signature Plus⁷ Premium⁷	Legacy	Email address	No other information is required.
Secure Email for Business	Multipurpose Strict	Email address	You must include the recipient’s first and last name or pseudonym.
⁷On July 1, 2025, we will end of life the old S/MIME certificate enrollment workflow in CertCentral.

CertCentral Services API: Updates to Sponsor validated product Endpoint Integrations

If you are not including the recipient’s first and last name or pseudonym in your request, you must update your Services API endpoint integration before July 1, 2025. Or the Services API will return an error instead of a success message, and your Sponsor validated certificate requests will not work as they did before July 1, 2025.

Requirements for the CertCentral Services API

Product	Certificate profile	Additional requirements
Secure Email for Business	Legacy	When using the common_name_indicator = email_address, the recipient’s first and last name or pseudonym are optional.
Secure Email for Business	Multipurpose Strict	When using the common_name_indicator = email_address, you must send either the recipient’s first and last name or pseudonym in the individual array.
Email Security Plus⁸ Digital Signature Plus⁸ Premium⁸	Legacy⁹	When using the email address or the recipient’s name for the common_name value, you don’t need to include the recipient’s first and last name or pseudonym.
Email Security Plus⁸ Digital Signature Plus⁸ Premium⁸	Multipurpose⁹	You must send either the recipient’s first and last name or pseudonym in the individual array¹⁰.
⁸ We will deprecate the Old S/MIME certificate enrollment workflow through the Services API in early 2026. ⁹ On July 1, 2025, we will change the certificate profile for old S/MIME products to Multipurpose from Legacy. ¹⁰In May 2025, the Individual array for old S/MIME products will be available for these endpoints in the Services API.

Trust Lifecycle Manager: Updates to the S/MIME certificate process

The new certificate generation profile requirement affects DigiCert® Trust Lifecycle Manager's S/MIME certificates that are issued using an S/MIME certificate template with the Legacy generation profile. Currently, Trust Lifecycle Manager’s S/MIME base templates only use the Legacy generation profile to issue your S/MIME certificates:

Public S/MIME Secure Email (via CertCentral)
Public S/MIME Secure Email using Certificate Management Protocol (CMP) (via CertCentral)
Public Secure Email Gateway (via CertCentral)
Public S/MIME for Intune (via CertCentral)

Changes to S/MIME templates, certificate profiles, and certificate issuance

Starting July 1, 2025, Trust Lifecycle Manager will block S/MIME certificate requests and stop issuing S/MIME certificates using the Legacy generation profile. Trust Lifecycle Manager will also block certificate replacements using the Legacy generation profile. When issuing replacement certificates, such as reissues, duplicates, and renewals, Trust Lifecycle Manager relies on the same certificate profile used to issue the original certificate.

What do I need to do before July 1, 2025?

If your S/MIME certificate profile is already configured with the Multipurpose or Strict certificate type, you do not have to do anything.

If you have a Legacy S/MIME certificate profile, use one of the options below to update your S/MIME certificate issuance process before July 1.

Create new S/MIME certificate profiles
You can create new S/MIME certificate profiles using one of the S/MIME base templates and select the Multipurpose or Strict certificate generation option. Then, use these new S/MIME certificate profiles to issue compliant certificates.

When creating new certificate profiles, we strongly recommend suspending the Legacy profile being replaced to make sure it can no longer be used to issue and renew certificates.

See our Trust Lifecycle Manager guide and the Create certificate profiles instructions.
Update your existing S/MIME certificate profiles
We will soon release a feature that allows you to edit your Legacy S/MIME profiles and change the certificate generation option from Legacy to Multipurpose or Strict. When this feature is ready, we will include it in the Trust Lifecycle Manager release notes.

Once you’ve updated the profile, new certificates and their subsequent renewals will successfully issue as Multipurpose or Strict. However, certificates issued prior to your profile change will fail to renew starting July 1, as the certificates are linked to a non-compliant Legacy profile.

Affected Base S/MIME templates:
- Public S/MIME Secure Email (via CertCentral)
- Public S/MIME Secure Email using Certificate Management Protocol (CMP) (via CertCentral)
- Public Secure Email Gateway (via CertCentral)
- Public S/MIME for Intune (via CertCentral)

WARNING: Starting July 1, Legacy generation S/MIME certificate renewals will fail from profiles still configured with the Legacy generation option. We strongly recommend that you Suspend these profiles to prevent any certificate renewal failures. To avoid disruptions to your S/MIME certificate issuance process, use one of the options above before July 1.

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