VaultSandbox: A Self-Hosted SMTP Testing Gateway for Realistic Email Testing
By
vaultsandbox
Crisp on the outside, thoughtful on the inside. A keeper.
Summary
VaultSandbox is a self-hosted, receive-only SMTP testing gateway designed to replace mock-based email testing. It behaves like a real production SMTP server by supporting TLS, DNS, authentication, spam filtering/scoring, and failure modes (chaos engineering). It aims to solve the problem of tests that pass with mocks but fail in production by providing a realistic testing environment that works with major email services like SendGrid, Postmark, and SES.
Key quotes
· 3 pulledVaultSandbox is a self-hosted, receive-only SMTP testing gateway that behaves like a real SMTP server including TLS, DNS, authentication, spam filtering/scoring, and failure modes so your tests stop lying to you.
Mocks answer one thing: 'Did my app send an email?' Everything else is usually invisible until production.
Production asks more: Was TLS negotiated correctly? Did SPF, DKIM, and DMARC pass? What happens when the server fails?
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