Add Clerk secondary email records

[jescalan]

Description

Add the four Clerk secondary email provider CNAME records in a new secondary_mail group. This lets Clerk include the Mailgun fallback-provider records only after secondary email provisioning completes, while preserving the existing auth and primary mail groups.

Type of change

• New template
• Bug fix (non-breaking change which fixes an issue in the template)
• New feature (non-breaking change which adds functionality to the template)
• Breaking change (fix or feature that would cause existing template behavior to not be backward compatible)

How Has This Been Tested?

• Template functionality checked using Online Editor
• Template file name follows the pattern <providerId>.<serviceId>.json
• resource URL provided with logoUrl is actually served by a webserver

Checklist of common problems

• syncPubKeyDomain is set
• warnPhishing is not set alongside syncPubKeyDomain
• syncRedirectDomain is set whenever the template uses redirect_uri in the synchronous flow
• no TXT record contains SPF content
• txtConflictMatchingMode is set on every TXT record that must be unique per label or content prefix
• no variable is used as a bare full record value
• no bare variable is used as the full host label
• no variable is used in the host field to create a subdomain
• %host% does not appear explicitly in any host attribute
• essential is set to OnApply on records the end user may need to modify or remove without breaking the template

Online Editor test results

Test clerk.com/app example.com/@

Test clerk.com/app example.com/app