A pre-import audit caught three places where outbound comms could escape
even with EMAIL_REDIRECT_TO set. Plugged each, added unit tests so the
behavior can't silently regress, and shipped a live smoke script the
operator can run before any production data import.
Leak 1: email-compose.service.ts (per-account user composer)
Built its own nodemailer transporter and called sendMail() directly,
bypassing the centralized sendEmail()'s redirect. Now mirrors the same
redirect: when EMAIL_REDIRECT_TO is set, "to" is rewritten, "cc" is
dropped, and the subject is prefixed with "[redirected from <orig>]".
Leak 2: documenso-client.sendDocument()
Tells Documenso to actually email the document. Recipient emails were
rerouted at create-time (in pass-3) but a document created BEFORE the
redirect was turned on could still trigger a real-client email. Now
short-circuited when the redirect is set — returns the existing doc
shape so downstream code doesn't see an unexpected null.
Leak 3: documenso-client.sendReminder()
Same shape as sendDocument: emails a stored recipient address that may
predate the redirect. Now short-circuits with a warn-level log.
Tests (tests/unit/comms-safety.test.ts):
- createDocument rewrites recipients
- generateDocumentFromTemplate rewrites both v1.13 formValues.*Email
keys AND v2.x recipients[] arrays
- sendDocument is short-circuited (no /send call)
- sendReminder is short-circuited (no /remind call)
- createDocument passes through unchanged when redirect unset
- sendEmail rewrites to + subject for single recipient
- sendEmail handles array of recipients (joined into subject prefix)
- sendEmail passes through unchanged when redirect unset
- Webhook worker reads process.env.EMAIL_REDIRECT_TO at dispatch time
(no module-level caching that could miss a runtime flip)
Live smoke (scripts/smoke-test-redirect.ts):
Monkey-patches nodemailer.createTransport, calls the real sendEmail()
with a fake real-client address, verifies the captured outbound has
the right "to" + subject. Run: `pnpm tsx scripts/smoke-test-redirect.ts`.
Exits non-zero if the redirect failed for any reason — drop-in for a
pre-deploy check.
Verification:
pnpm exec tsc --noEmit — 0 errors
pnpm exec vitest run — 936/936 (was 926, +10 new safety tests)
pnpm tsx scripts/smoke-test-redirect.ts — PASS
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
