Show HN: VaultSandbox – Real SMTP testing that works on localhost (Apache 2.0)

Hi HN,I posted VaultSandbox two months ago and the main feedback was AGPL concerns. I've listened: it's now Apache 2.0. I've also overhauled the local experience to make it "just work" on localhost with zero config.VaultSandbox is a self-hosted SMTP receiver …