[jescalan]

Summary

Follow-up to the Postmark send-path removal (clerk_go#21398). That PR deleted the behavior; this one deletes the field.

The setting no longer affects anything: routing, unverified-DNS suppression, template forcing, and the magic-link validator were all removed, and every remaining instance was flipped to false in production on 2026-08-26 (20 production + 14 development). What is left is an inert boolean on the API surface, plus dead config.

Rollout ordering

Only one ordering constraint remains:

1. clerk_go#21398 (behavior removal) — merged and released.
2. dashboard#10112 before clerk_go#21613. #21613 stops DAPI returning enhanced_email_deliverability, and the dashboard reads it today for the email-logs banner. The failure mode is soft — the value would just read as undefined and the banner would hide — but shipping the consumer first avoids a window where the dashboard reads a field the API no longer returns.
3. clerk_go#21613.

Everything else is independent and can land in any order: backoffice#724 is type-only with no reader, terraform-app-infra#3193 removes config nothing reads (the cenv constants went out with #21398), clk#49 is documentation, and the SDK PRs land on their owners' release cadence.

No released API contract changes. An earlier revision of clerk_go#21613 removed the field from the base FAPI Client schema — which is inherited by all six API versions, so it would have dropped a required field from five stable versions that clients pin to. FAPI and BAPI now keep serializing it as false instead.

Still outstanding after this

The ENHANCED_DELIVERABILITY_POSTMARK_SERVER_TOKEN secrets remain in four SOPS-encrypted files (production and staging, api_common and pubsubworker). They need someone with sops keys. The Postmark account itself also still needs decommissioning.

Changes in this repo

Removes the retired enhancedEmailDeliverability setting from @clerk/backend: the InstanceApi.updateInstance param, the InstanceSettings resource, and its JSON type. The param has been a server-side no-op since the delivery path was retired, and the Backend API now ignores it entirely.

Breaking change to a public type, so a major changeset is included. Flagged as draft for the SDK owners to slot into their release cadence - no rush, the server tolerates clients that still send the field.

Companion PRs

• backoffice: https://github.com/clerk/backoffice/pull/724
• clerk-sdk-go: Remove the enhanced_email_deliverability API surface clerk-sdk-go#599
• clerk_go: https://github.com/clerk/clerk_go/pull/21398
• dashboard: https://github.com/clerk/dashboard/pull/10112
• terraform-app-infra: https://github.com/clerk/terraform-app-infra/pull/3193
• clerk_go:api-surface: https://github.com/clerk/clerk_go/pull/21613

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
clerk-js-sandbox	Ready	Preview	Aug 28, 2026 2:55pm
swingset	Ready	Preview	Aug 28, 2026 2:55pm

[changeset-bot]

🦋 Changeset detected

Latest commit: 3d4c750

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@clerk/backend	Major
@clerk/astro	Patch
@clerk/express	Patch
@clerk/fastify	Patch
@clerk/hono	Patch
@clerk/nextjs	Patch
@clerk/nuxt	Patch
@clerk/react-router	Patch
@clerk/tanstack-react-start	Patch
@clerk/testing	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

Open in StackBlitz

@clerk/astro

npm i https://pkg.pr.new/@clerk/astro@9586

@clerk/backend

npm i https://pkg.pr.new/@clerk/backend@9586

@clerk/chrome-extension

npm i https://pkg.pr.new/@clerk/chrome-extension@9586

@clerk/clerk-js

npm i https://pkg.pr.new/@clerk/clerk-js@9586

@clerk/electron

npm i https://pkg.pr.new/@clerk/electron@9586

@clerk/electron-passkeys

npm i https://pkg.pr.new/@clerk/electron-passkeys@9586

@clerk/eslint-plugin

npm i https://pkg.pr.new/@clerk/eslint-plugin@9586

@clerk/expo

npm i https://pkg.pr.new/@clerk/expo@9586

@clerk/expo-google-signin

npm i https://pkg.pr.new/@clerk/expo-google-signin@9586

@clerk/expo-passkeys

npm i https://pkg.pr.new/@clerk/expo-passkeys@9586

@clerk/express

npm i https://pkg.pr.new/@clerk/express@9586

@clerk/fastify

npm i https://pkg.pr.new/@clerk/fastify@9586

@clerk/hono

npm i https://pkg.pr.new/@clerk/hono@9586

@clerk/localizations

npm i https://pkg.pr.new/@clerk/localizations@9586

@clerk/nextjs

npm i https://pkg.pr.new/@clerk/nextjs@9586

@clerk/nuxt

npm i https://pkg.pr.new/@clerk/nuxt@9586

@clerk/react

npm i https://pkg.pr.new/@clerk/react@9586

@clerk/react-router

npm i https://pkg.pr.new/@clerk/react-router@9586

@clerk/shared

npm i https://pkg.pr.new/@clerk/shared@9586

@clerk/tanstack-react-start

npm i https://pkg.pr.new/@clerk/tanstack-react-start@9586

@clerk/testing

npm i https://pkg.pr.new/@clerk/testing@9586

@clerk/ui

npm i https://pkg.pr.new/@clerk/ui@9586

@clerk/upgrade

npm i https://pkg.pr.new/@clerk/upgrade@9586

@clerk/vue

npm i https://pkg.pr.new/@clerk/vue@9586

commit: 3d4c750