Email

@caisson/email is the transactional-email port. Resend is the default driver, and it sits behind the port like every other vendor in the base — call sites depend on the port, not the SDK.

The contract

A test driver captures sends in memory, so a suite asserts on what would have been emailed — recipient, template, payload — without a network call or a live key.

import { sendEmail } from "@caisson/email";

await sendEmail({
  to: user.email,
  template: "verify-email",
  data: { url },
});

Under the standards gate the same call resolves to the test driver, so email behavior is verified deterministically:

import { testEmail } from "@caisson/email/testing";

// The send is captured, not transmitted.
expect(testEmail.outbox).toHaveLength(1);

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