Marketing automation + CRM (owns Postmark).
ActiveCampaign is marketing automation. MailKite is inbound-first infra — pair them.
A minimal, copy-paste starter. Swap in your own domain and API key.
import { MailKiteClient } from "@mailkite/client";
// One API, your own DKIM-signed domain — no mail server to run
const mailkite = new MailKiteClient({ token: process.env.MK_API_KEY! });
await mailkite.send({
from: "you@yourdomain.com", // any address on a verified domain
to: "user@example.com",
subject: "Hello from ActiveCampaign",
html: "<p>Sent in milliseconds via MailKite.</p>",
}); ActiveCampaign is a marketing automation and CRM platform known for its industry-leading automation builder (branching, scoring, site tracking). It acquired Postmark (2022), which runs as its own brand, and offers transactional email as an add-on.
Tiered by contacts
Email platforms
Full-stack developer email APIs for sending and receiving.
Point a domain, drop in a webhook URL, and send your first email in minutes. Unlimited domains, no credit card.