> ## Documentation Index
> Fetch the complete documentation index at: https://docs.stackra.figentra.com/llms.txt
> Use this file to discover all available pages before exploring further.

# 0035 — Resend for email, with SPF, DKIM and DMARC

> Proposed · 2026-10-19

## Context

Products send transactional email (sign-in links, receipts). Deliverability depends on authenticated sending domains.

## Decision

1. **Resend is the email provider**, behind the `@stackra/notifications` email channel driver, so it can be swapped.
2. **Every sending domain publishes SPF, DKIM and DMARC records** before it is used in an environment.
3. The API key is a secret held in Infisical, by name only ([0009](/adr/0009-secrets-two-mechanisms)).
4. DMARC policy progression (`none`, then `quarantine`, then `reject`): TODO.

## Consequences

* One vendor and one driver to operate; DNS records are part of environment setup.

## Enforcement

Planned — a runway check that the DNS records for a deploy target's sending domain exist and validate.

## Supersedes and sources

Supersedes: none. Sources: owner decisions in chat, 2026-10-19.


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.