Catch every email,
every time.

Your developer-first fake inbox for testing emails, SMS, voice IVR, push notifications, and webhook dumps.

.env

SMTP & REST

# 1. Point your app to Sinkbox

MAIL_HOST=smtp.sinkbox.dev

MAIL_USERNAME=api_user

MAIL_PASSWORD=api_password

# 2. Inspect with instant simulator previews

✓ Email HTML linting & spam scoring

✓ SMS, Push, Voice IVR & Webhooks

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Keeping the sink pressure in check

While in beta we want all our users to have a smooth experience. To make that happen, we're rolling out access gradually. Join the waitlist and we'll let you know as soon as you're in!

Sinkbox is a developer-friendly mail catcher and sink for email, SMS, and webhooks — the easiest way to test your integrations without the noise.

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Catch every email, every time.

Keeping the sink pressure in check

Catch every email,
every time.