Alternatives
Products that do what INBX does
Zero clutter. Total compliance. The secure B2B inbox.
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Hi HN :) really excited to share this with you. The one thing AI reliably does is generate noise. Half the tools I see launch are just machines for producing more noise across more channels. And people are starting to see this in the form of emails in their inboxes as spam filters are struggling. There used to be a useful signal in email: the effort a sender put into customizing a message was a rough proxy for how relevant it actually was. AI killed that. Now it's customized slop with the appearance of effort with none of the cost. It is painful that the open internet / open channels…
Jul 2026 · captchainbox.com
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After struggling with low open rates in my small lifestyle software business, I decided to go down the rabbit hole that is email deliverability, learned a bunch of things I didn't know even after being in tech for a decade. A/B tested a bunch of things and finally got good results. I then decided to put together a comprehensive checklist of everything I learned and got me results to share with others. Now I help companies fix poor email deliverability and boost their email ROI. I want this checklist to be a repository of email best practices so I'm always looking to improve and update…
2023 · helloinbox.net
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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…
Jan 2026 · vaultsandbox.com
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Hi everyone! I’ve been working on a small personal finance tool called Tender for the better part of a year. I got tired of doing expenses by hand - going through several accounts to figure out refunds, subscription cancellations, getting paid back via venmo, etc. I’d get to the point where I’d have to go through months of transactions at a time if I got lazy and fell behind. The workflow in Tender is centered around getting to inbox-zero. Transactions leave the inbox when they’re categorized and there’s a basic rules engine for automation. You can also do things like add notes, set…
2023 · tender.run
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