VaultSandbox

What it does

Keep your provider and your config. Just swap the recipient to validate real TLS, DNS, and SPF/DKIM entirely inside your VPC. Works with Postmark, SendGrid, SES, and more.

• VT
  VaultSandbox – Test your real MailGun/SES/etc. integrationJan 2026 · vaultsandbox.com · ▲58

  I've spent the last few months working on something I wish I'd had years ago. I kept running into the same issue: CI green, production mail broken. TLS handshake failures, DKIM alignment mismatches, SPF soft-fails ... the stuff that only surfaces when real mail servers are involved. Most test tools (Mailpit, MailHog) are catch-alls. They confirm "an email was sent" but don't validate the protocol. They also aren't designed for network-exposed environments: no auth, unprotected Web UI, easy to enumerate messages. VaultSandbox is my attempt at fixing that. It's a self-hosted SMTP gateway…

• AF
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  SendPitFeb 2026 · sendpit.com · ▲2

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