SparkPost

The SparkPost adapter calls the SparkPost Transmissions API with plain fetch. Two things set it apart: a sandbox option that routes sends through SparkPost's shared sandbox domain for testing, and tags become SparkPost substitution_data as name: value pairs instead of a flat list.

SparkPost

@opencoredev/email-sdk/sparkpost

OfficialNot API testedRequest tested

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Configure

Create an API key with Transmissions permission in the SparkPost dashboard. SparkPost expects the raw key in the Authorization header, so the adapter sends it without a Bearer prefix.

import { createEmailClient } from "@opencoredev/email-sdk";
import { sparkpost } from "@opencoredev/email-sdk/sparkpost";

export const email = createEmailClient({
  adapters: [sparkpost({ apiKey: process.env.SPARKPOST_API_KEY! })],
});

Send

SparkPost maps replyTo, headers, attachments, metadata, and tags (each tag becomes a substitution_data entry keyed by its name). sendAt schedules the transmission natively as options.start_time; SparkPost accepts at most 3 days in the future.

const result = await email.send({
  from: { email: "alerts@acme.com", name: "Acme Alerts" },
  to: "user@example.com",
  replyTo: "support@acme.com",
  subject: "Usage alert: 90% of plan limit",
  html: "<p>Your workspace is at 90% of its monthly quota.</p>",
  metadata: { workspaceId: "ws_123" },
  tags: [{ name: "type", value: "usage-alert" }],
});

console.log(result.id); // SparkPost transmission id

The response id is the transmission id from results.id (or results.transmission_id). Use it to query SparkPost's events API for delivery status.

Verify from the CLI

SPARKPOST_API_KEY="..." npx email-sdk doctor --adapter sparkpost

SPARKPOST_API_KEY="..." npx email-sdk send \
  --adapter sparkpost \
  --from "Acme <hello@acme.com>" \
  --to user@example.com \
  --subject "SparkPost smoke test" \
  --text "It works" \
  --dry-run

Drop --dry-run for one real send, or set sandbox: true in code first to exercise the API through SparkPost's shared sandbox domain before touching your own.