Secure outbound email gateway
One strict API. Every email validated, sanitized and logged.
MailRelay forwards already-composed emails from your applications to Resend after API key authentication, sender allowlists, HTML sanitization and per-app rate limits. No inbox. No campaigns. Just a reliable, auditable mail gateway.
API key auth
Hashed keys with pepper. Shown once on creation.
Sender control
Per-app allowlist of exact addresses or whole domains.
Rate limits
Hourly buckets per application, 429 on overflow.
Full logging
Every attempt logged with status, errors and sanitized body.