feat(workflows): test templates with the sandbox sender by Silthus · Pull Request #624 · Silthus/posthog

Silthus · 2026-10-27T10:56:49Z

Problem

A project trying the sandbox sender cannot test a message template with it: the template "Send test email" modal leaves the sandbox sender out (since feat(workflows): provision a managed sandbox email sender #601), so a team with no verified domain has no sender to test with.
The sandbox sender only delivers to verified members of the organization, and the modal gives no hint which addresses those are.
This PR sits on feat(workflows): confirm before the sandbox sender replaces senders #616. It replaces the sandbox and suggestion parts of feat(workflows): test templates with the sandbox sender #451; that PR's skip reporting moves to its own PR (TS1). Ticket: Silthus/personal#202.

Impact

Pays into Workflows activation through the sandbox funnel step: a team without a verified domain can send itself a template test before it sets up its own sender.

Merge Danger

Note

🔵 Merge risk: low · two-way door (merge-risk rubric)

Every change sits behind workflows-sandbox-sender; with the flag off the modal lists the same senders and prefills the recipient as on master.
The send request changes only when the sandbox sender is selected, and the worker still decides delivery.

Changes

With workflows-sandbox-sender on, "From" lists the sandbox sender after the verified own senders, with a "Sandbox" tag and the note "Delivers only to verified members of your organization." when it is selected.
With no verified own sender, the modal preselects the sandbox sender.
"Send to" suggests verified teammates, signed-in user first, and still accepts any typed address. It starts empty instead of prefilled, so the suggestions show.
With the sandbox sender selected:
- An address outside the suggestions shows a warning with "Add your own sender". It does not block the send; the worker decides who receives it.
- Typing your own address while it is unverified asks you to verify it.
- "Send test email" waits while the member list loads ("Checking your organization members").
A sandbox test sends without the template's custom From name, address and Reply-To, which the sandbox sender ignores.
With the flag off, the modal behaves as on master.
Provisioning stays on Channels (feat(workflows): show the managed sandbox sender in channels #602): the modal lists the sandbox sender once Channels created it.

Production lines (tests, stories and inline kea typegen excluded): 215, from git diff --numstat against #616.

How did you test this code?

Lane gate on the head:

Typecheck (pnpm --filter=@posthog/frontend typescript:check, on a Fleet box): no errors.
Jest: the TemplateLibrary suites, 71 passed.
Oxfmt and Oxlint on the changed files: no errors. Pre-push hogli ci:preflight --strict: 0 failures.
CI: not run. Fork CI cannot run because the fork lacks the GitHub App secret.

Test seams:

messageTemplateTestSendLogic (kea logic with mocked integrations, members and invocation APIs): which senders the modal lists and preselects, flag on and off, the recipient suggestions and warnings, and the request a sandbox test sends.
SendTestEmailModal (rendered with the real logic): the unverified-self prompt, the member loading state, and picking or typing a recipient through the field, which only the DOM shows.

Test rationale:

messageTemplateTestSendLogic.test.ts, new sandbox sender block: preselection, ordering, flag-off drop of a stale selection, member suggestions when the flag lands on an open modal, the stripped From and Reply-To, the outside-address warning (case-insensitive, unverified and unknown members excluded), and the hold while members load. Plus one case for the empty recipient with the flag on. Each failed before the change. The nearest existing test, "defaults the sender to the first verified email integration", still guards the flag-off list.
SendTestEmailModal.test.tsx: the unverified-self prompt beats the outside-address warning; the field shows a skeleton while members load and the empty hint after; a picked suggestion and a typed address (Enter) both reach the send request. The last case fails when the field's onChange is disconnected from the logic. No rendered test covered this modal before.

Proof (recorded with fleet proof on the head):

UI walk on a seeded local preview, flag on, one verified own sender, the sandbox sender, two verified members:

From menu Recipient suggestions Address outside the suggestions
Live run on the same preview: a test from the sandbox sender to a suggested member sent from: {"integrationId": <sandbox>} and replyTo: "", without the template's custom From. The worker skipped the send (no delivery route yet), and the API still answered success; reporting that skip is TS1.
The head adds only a rendered test, so both reuse the evidence from a0bef769cf4.
Prod shape: gap, accepted until read-only production access arrives. The change is frontend-only behind the flag.
CI: gap, fork CI cannot run (see above).

Reviews (GPT-6.1 Sol, high):

Round 1 on a0bef769cf4, two findings:
- The modal offers a sender the worker cannot deliver yet. Rejected: the flag turns on only after the worker's sandbox route, per docs/internal/workflows-email-sending-tiers.md, and the workflow email step already offers the same sender under the same flag.
- No test drove the new recipient field. Fixed in b37800cb0c6.
Final read on b37800cb0c6: no findings.
Design pass before opening: one minor finding (members loaded on every flag update), fixed in a0bef769cf4.

Release status

This change is behind a feature flag and is not available to users

Docs update

None.

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Agent: Claude Code, Claude Opus 5.5 (porting); review by GPT-6.1 Sol

Ported from feat(workflows): test templates with the sandbox sender #451 (f1e44aa7116), keeping only the sandbox sender and suggestion parts. Left out: skip reporting (TS1), sandbox provisioning from the modal and its retry banner (Channels owns provisioning), and the worker changes (nodejs/, its own lane).
Skills: tdd, writing-tests, pr-description.

Decisions

Question	Answer	Who	Where
Provisioning from the test-send modal	None; Channels provisions the sandbox sender, the modal lists it once it exists	🤖 Agent	Silthus/personal#202
Skip reporting from #451	Left to its own PR (TS1), for every sender	🤖 Agent	Silthus/personal#202
Recipient outside the suggestions	Warn, do not block; the worker enforces who receives a sandbox send	🤖 Agent	Silthus/personal#202
When members load	When the modal is open with the flag on, through a subscription, not on every flag update (design pass)	🤖 Agent	Silthus/personal#202

🤖 Generated with Claude Code

github-actions · 2026-10-27T11:00:02Z

🤖 CI report

⚠️

Complexity (TypeScript) — 1 function above the limit (max 15)

Cyclomatic complexity above the limit in changed typescript files (10 for production files, 15 for test files). Warn only: worth simplifying when you next touch these functions.

Function	Location	Complexity	Limit
`SendTestEmailModal`	`products/workflows/frontend/TemplateLibrary/SendTestEmailModal.tsx:44`	15	10

⚠️

Bundle size — 🔺 +2.4 KiB (+0.0%)

Uncompressed size of every built .js bundle, compared against the base branch.

Total: 76.90 MiB · 🔺 +2.4 KiB (+0.0%)

File	Size	Δ vs base
`posthog-app/_parent/products/workflows/frontend/TemplateLibrary/MessageTemplate.js`	42.5 KiB	🔺 +2.4 KiB (+5.9%)

_{Posted automatically by build-bundle-size-report · uncompressed bytes from dist-report}

✅ Eager graph — within budget

How much code each root ships on the eager path — downloaded and parsed before the surface is interactive. Measured from the esbuild output chunks (post-tree-shake, static imports only); lazy import() / React.lazy chunks are not counted.

Root	Eager (shipped)	Δ vs base	Budget
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Largest files eagerly shipped from src/scenes/web-analytics/WebAnalyticsScene.tsx

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322.9 KiB	`../node_modules/.pnpm/posthog-js@1.438.23_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs`
286.4 KiB	`src/taxonomy/core-filter-definitions-by-group.json`
239.9 KiB	`../packages/quill/packages/quill/dist/index.js`
217.5 KiB	`../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js`
182.9 KiB	`src/queries/validators.js`
153.8 KiB	`../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js`
144.1 KiB	`../packages/quill/packages/primitives/dist/index.js`
126.8 KiB	`../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js`
100.8 KiB	`src/products.tsx`
94.5 KiB	`../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js`

Largest files eagerly shipped from src/scenes/session-recordings/detail/SessionRecordingDetail.tsx

Size	File
322.9 KiB	`../node_modules/.pnpm/posthog-js@1.438.23_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs`
316.1 KiB	`../node_modules/.pnpm/posthog-js@1.438.23_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/rrweb.js`
286.4 KiB	`src/taxonomy/core-filter-definitions-by-group.json`
239.9 KiB	`../packages/quill/packages/quill/dist/index.js`
217.5 KiB	`../node_modules/.pnpm/@posthog+icons@0.39.0_react-dom@18.3.1_react@18.3.1__react@18.3.1/node_modules/@posthog/icons/dist/posthog-icons.es.js`
153.8 KiB	`../node_modules/.pnpm/re2js@0.4.1/node_modules/re2js/build/index.esm.js`
126.8 KiB	`../node_modules/.pnpm/react-dom@18.3.1_react@18.3.1/node_modules/react-dom/cjs/react-dom.production.min.js`
100.8 KiB	`src/products.tsx`
94.5 KiB	`../node_modules/.pnpm/@tiptap+core@3.20.6_@tiptap+pm@3.20.6/node_modules/@tiptap/core/dist/index.js`
92.5 KiB	`../node_modules/.pnpm/prosemirror-view@1.40.1/node_modules/prosemirror-view/dist/index.js`

_{Posted automatically by check-eager-graph · sizes are eager output bytes (shipped, post-tree-shake) from the esbuild metafile · part of PostHog#32479}

✅ Toolbar bundle — eager 2.29 MiB within budget

What the toolbar ships to customer pages, measured from the esbuild output (minified, post-tree-shake). The eager set is the entry plus everything statically imported from it — fetched before any feature runs; deferred chunks load lazily. The eager guardrail is 5.72 MiB. Each output file must also stay below 10 MB, where CloudFront stops compressing it. The module boundary is enforced separately by check-toolbar-graph.

Metric	Size	Δ vs base	Budget
Eager (shipped) entry + static imports	2.29 MiB · 18 files	no change	`████░░░░░░` 40.1% of 5.72 MiB
Deferred (lazy)	2.11 MiB · 40 files	no change	n/a — loads on demand
Loader `dist/toolbar.js`	1.2 KiB	no change	`█░░░░░░░░░` 6.0% of 19.5 KiB

Largest eagerly-shipped chunks

Size	File
905.3 KiB	`dist/toolbar/toolbar-app-43F3LTS4.css`
694.9 KiB	`dist/toolbar/chunk-chunk-RMNWTSQQ.js`
259.9 KiB	`dist/toolbar/chunk-chunk-ONRHJSKR.js`
131.8 KiB	`dist/toolbar/chunk-chunk-FDH2IBXT.js`
130.4 KiB	`dist/toolbar/chunk-chunk-5MLEINKO.js`
74.8 KiB	`dist/toolbar/toolbar-app-H7P3OE74.js`
69.0 KiB	`dist/toolbar/chunk-chunk-TSAL54PB.js`
35.6 KiB	`dist/toolbar/chunk-chunk-PTEIVUXK.js`
21.7 KiB	`dist/toolbar/chunk-chunk-TC7UYGIJ.js`
6.8 KiB	`dist/toolbar/chunk-chunk-DV7IWQNF.js`

_{Posted automatically by check-toolbar-size · sizes are toolbar output bytes (shipped, post-tree-shake) from the esbuild metafile}

✅ Dist folder size — 🔺 +22.1 KiB (+0.0%)

Total size of the built frontend/dist folder (all assets), compared against the base branch.

Total: 969.36 MiB · 🔺 +22.1 KiB (+0.0%)

Silthus added a commit that referenced this pull request Oct 27, 2026

Add proof for #624 at a0bef76

02b2baa

Silthus added a commit that referenced this pull request Oct 27, 2026

Add proof for #624 at a0bef76

e4039e0

Silthus added a commit that referenced this pull request Oct 27, 2026

Add proof for #624 at a0bef76

06ddfe5

Silthus mentioned this pull request Oct 27, 2026

feat(workflows): test templates with the sandbox sender #451

Closed

Silthus merged commit 1c08de0 into workflows-sandbox-product/sender-confirmations Oct 28, 2026

Silthus force-pushed the workflows-sandbox-product/sender-confirmations branch from c569c18 to 7f851f2 Compare October 28, 2026 10:00

Silthus force-pushed the workflows-sandbox-product/test-sends branch from b37800c to 1c08de0 Compare October 28, 2026 10:00

Silthus mentioned this pull request Oct 28, 2026

feat(workflows): test templates with the sandbox sender #628

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feat(workflows): test templates with the sandbox sender - #624

feat(workflows): test templates with the sandbox sender#624
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Silthus commented Oct 27, 2026 •

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Silthus commented Oct 27, 2026 •

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