feat(workflows): test templates with the sandbox sender by Silthus · Pull Request #628 · Silthus/posthog

Silthus · 2026-10-28T10:01:56Z

Replaces #624. GitHub marked #624 merged into its old base when the stack was reordered, so this draft carries the same branch.

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): show the managed sandbox sender in channels #602. 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.

Stack

Slice V1 of the sandbox sender rollout: a team sends a test email from the sandbox sender to verified members of its organization. Slice order: feat(workflows): restrict sandbox email to verified org members #594 → feat(workflows): route sandbox email through its fixed ses identity #599 → feat(workflows): cap sandbox sends per project and recipient each day #604 → feat(workflows): provision a managed sandbox email sender #601 → feat(workflows): show the managed sandbox sender in channels #602 → feat(workflows): test templates with the sandbox sender #628.
Base: workflows-sandbox-product/channels-row (feat(workflows): show the managed sandbox sender in channels #602). Lands after feat(workflows): show the managed sandbox sender in channels #602 and every PR below it.
Production lines: 263 (tests, stories, generated types, migrations and docs excluded).
Rebuilt on 2026-10-28 on the current master, in the new slice order. Defines SANDBOX_EMAIL_SENDER_NOTE, which used to come from the email step picker, now above it. The unverified-member test fixture uses example.com.
Merged on 2026-10-31. The test-send logic imports membersLogic from master's new home, ~/models/membersLogic.
V1 opens as 5 PRs, feat(workflows): restrict sandbox email to verified org members #594 to feat(workflows): show the managed sandbox sender in channels #602, to stay inside the stack-depth limit. feat(workflows): test templates with the sandbox sender #628 opens after feat(workflows): restrict sandbox email to verified org members #594 lands.
Lane gate on 237a3ab1ce1: frontend typecheck has no errors in the stack's files (the remaining errors also occur on master), touched Jest suites 45 passed. Pre-push hogli ci:preflight --strict passed. Review: GPT-6.1 Sol (high) read the conflict resolutions of the master merge, no findings.
Proof on 237a3ab1ce1:
- Live run on 2026-10-31 at the slice tip 237a3ab1ce1: a real cdp-api and email worker, with SES, DNS and personhog stubbed. Member sends went out through the sandbox tenant and recorded sent. A non-member recorded recipient_unreachable, a send over the recipient cap frequency_capped, and a send with the switch off sending_suspended.
- UI walk carried from 1c08de0b9b4: this PR's own diff changed only by that import path.
- Proof gate: fails only on the ci gap (exit 3). Fork CI cannot run Semgrep or the Depot jobs, and the lane check counts the Node layers below, because it diffs against master. This PR's own diff has no Node file.

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): 263, from git diff --numstat against #602.

How did you test this code?

Live run on the slice tip

Live run of the V1 tip 1c08de0b9b4 on a PostHog preview. Stubs: a local SES endpoint that records each call, and example.com seeded as a valid MX domain.
Channels created the sandbox sender. A test send to a verified member was accepted and reached SES with the sandbox tenant, its configuration set, the fixed From address and the footer.
A test send to an address outside the organization was skipped before SES.

Send test email suggests verified members	Warning for an address outside the organization	Test email sent to a member

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
Test fixture domain	Reserved `example.com` instead of a real domain	👍 Accepted default	map
Slice order of the sandbox sender stack	Option B: the Channels row moves into V1 so a team has a sender to test from; V1's worker PRs land first	👍 Accepted default	map
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

The template test send lists the sandbox sender last, with a Sandbox tag and the members-only note, and preselects it when the project has no verified own sender. With the workflows-sandbox-sender flag on, the recipient field suggests verified teammates, signed-in user first, and warns about addresses outside them. A sandbox test drops the template's custom From and Reply-To, which the sandbox sender ignores. Refs Silthus/personal#202 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Members load when the modal opens with the sandbox sender flag on, or when the flag turns on while the modal is open. Other feature flag updates no longer reload the member list. Refs Silthus/personal#202 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

… domain The test send modal is now the first place that shows the note, so it defines it. The unverified member fixture uses example.com. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

…roduct/test-sends

github-actions · 2026-10-31T10:36:10Z

🤖 CI report

⚠️

Complexity (TypeScript) — 2 functions above the limit (max 26)

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
`getIntegrationNameFromKind`	`frontend/src/lib/integrations/utils.ts:149`	26	10
`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: 75.14 MiB · 🔺 +2.4 KiB (+0.0%)

File	Size	Δ vs base
`posthog-app/_parent/products/workflows/frontend/TemplateLibrary/MessageTemplate.js`	43.8 KiB	🔺 +2.4 KiB (+5.7%)

_{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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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`
102.9 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`
86.6 KiB	`src/lib/api.ts`

Largest files eagerly shipped from

src/scenes/AuthenticatedShell.tsx + src/scenes/project-homepage/ProjectHomepage.tsx + src/scenes/project-homepage/ai-first/AiFirstHomepage.tsx

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325.0 KiB	`../node_modules/.pnpm/posthog-js@1.443.0_@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`
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`
102.9 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`

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Size	File
325.0 KiB	`../node_modules/.pnpm/posthog-js@1.443.0_@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`
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`
102.9 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`

Largest files eagerly shipped from src/scenes/web-analytics/WebAnalyticsScene.tsx

Size	File
325.0 KiB	`../node_modules/.pnpm/posthog-js@1.443.0_@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`
187.9 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`
102.9 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
325.0 KiB	`../node_modules/.pnpm/posthog-js@1.443.0_@types+react@18.3.27_react@18.3.1/node_modules/posthog-js/dist/module.mjs`
316.5 KiB	`../node_modules/.pnpm/posthog-js@1.443.0_@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`
102.9 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 2.33 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	2.33 MiB · 19 files	no change	`████░░░░░░` 40.8% of 5.72 MiB
Deferred (lazy)	2.11 MiB · 42 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
941.7 KiB	`dist/toolbar/toolbar-app-6533LMUX.css`
695.9 KiB	`dist/toolbar/chunk-chunk-AOHKDG2B.js`
261.2 KiB	`dist/toolbar/chunk-chunk-T5DKNJQU.js`
131.8 KiB	`dist/toolbar/chunk-chunk-FDH2IBXT.js`
130.4 KiB	`dist/toolbar/chunk-chunk-SSYQK5JZ.js`
75.7 KiB	`dist/toolbar/toolbar-app-PQOKMEAX.js`
69.0 KiB	`dist/toolbar/chunk-chunk-TSAL54PB.js`
33.8 KiB	`dist/toolbar/chunk-chunk-FR2SFTP5.js`
21.7 KiB	`dist/toolbar/chunk-chunk-BAJO3I74.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 — 🔺 +22.7 KiB (+0.0%)

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

Total: 966.41 MiB · 🔺 +22.7 KiB (+0.0%)

Silthus · 2026-11-03T16:56:03Z

Replaced by PostHog#128413.

Silthus and others added 4 commits October 28, 2026 09:28

test(workflows): cover picking and typing a test-send recipient

e04c2e8

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

chore(workflows): own the sandbox sender note and use a reserved test…

1c08de0

… domain The test send modal is now the first place that shows the note, so it defines it. The unverified member fixture uses example.com. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Silthus added a commit that referenced this pull request Oct 28, 2026

Add proof for #628 at 1c08de0

f0ff667

Silthus added a commit that referenced this pull request Oct 28, 2026

Add proof for #628 at 1c08de0

a0555e1

Silthus added a commit that referenced this pull request Oct 28, 2026

Add proof for #628 at 1c08de0

92948b1

Merge workflows-sandbox-product/channels-row into workflows-sandbox-p…

237a3ab

…roduct/test-sends

Silthus closed this Nov 3, 2026

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

feat(workflows): test templates with the sandbox sender#628
Silthus wants to merge 5 commits into
workflows-sandbox-product/channels-rowfrom
workflows-sandbox-product/test-sends

Silthus commented Oct 28, 2026 •

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Silthus commented Oct 28, 2026 •

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