Resend

The paper trail your customers trust.

ARRIVES, READ

ON THIS BUILD: USED ON THIS BUILD
WHERE IT RUNS: Mail · transactional only · server only
OFFICIAL DOCS: Read the reference →

What it is

The transactional mail layer for this site's funnel: brief confirmations, sign-in codes and account notices. It is deliberately narrow — no bulk, no marketing, no agent-sent outreach.

What it does for your business

For your business it means the mail that must arrive is typed, gated and logged; everything else has to be a human decision.

Why it earns its place

A brief confirmation and a sign-in code have to arrive. They also have to be the only things this system can send without a person choosing to send them.

This site's brief confirmations and login codes go through it.

THE TOOL

Open Resend Read the official docs →

The gate is the feature

USED ON THIS BUILD

Recipients

one per call

Scope

transactional

Non-production

captured, not sent

Agent outreach

refused

The source has no general-purpose send function. That is deliberate: an agent cannot call a function that does not exist.

How it runs here

Every send is a typed function with one recipient and a pinned subject. The mailer checks the suppression table, renders HTML and plain text, adds the compliance footer and unsubscribe headers, then calls Resend. Non-production runs capture the message instead of opening a socket.

A TYPED SEND

export async function sendBriefConfirmation(  to: string,  businessName: string,  token: string,): Promise<SendOutcome> {  const addr = assertSingle(to);  const link = `${siteUrl()}/status/${token}`;  return deliver(addr, subject, html, text, "brief_note");}

When it runs

A person files a brief, requests a sign-in code, receives an account notice, or a human sends an approved reply from the workbench. Not for agent-initiated outreach.

Who owns it

Build owns the templates. Compliance owns the footer and suppression rule. The operator owns the sender domain and the live keys.

What it does not claim

Deliverability is not a guarantee. The system can prove a message was accepted by the provider; it cannot prove an inbox placed it in the primary tab.

THE REFERENCE

The manual above is ours. The vendor's reference is the place to check an API, a version or a limit.

Open the official docs →

This is the tool. The process is what turns it into your business.

File the brief