Changelog

What’s new in Herald, newest first.

November 2026: the first release

The API, with Resend-compatible routes: send one email or a batch of 100, scheduled or now, with idempotency keys, tags and attachments. Errors are RFC 9457 problems that Resend’s SDKs read.
SMTP on 465 and 587, with your API key as the password.
The SDK, @heraldmail/sdk: every endpoint, React Email rendered in your process, and webhook verification. No dependencies.
Domains with DKIM (RSA, and Ed25519 if you choose), an aligned return path, and checks that keep watching.
Webhooks, signed with Standard Webhooks (and Svix’s header names), retried for three days, with replay and test events.
Open and click tracking, on your own domain if you like, and one-click unsubscribe.
Test mode: test keys never send; their mail lands in Console’s Test inbox.

Passkey sign-in, teams and roles, and an audit log.
The email log with live tail, and each email’s timeline.
Templates in a block editor, previews in a sandbox, checks and test sends.
Contacts, topics, lists, segments and imports; the preference centre.
Broadcasts with pre-flight checks, a canary and breakers; deliverability and Gmail’s view.
Automations on a canvas, with test runs.
Inbound mail, with authentication badges and images held back until you ask.

Herald Backoffice, for the platform team, behind device certificates and passkeys.
This site and its docs, including the API reference.