About Humainbox
A single-purpose contact-form spam filter
Humainbox started in 2026 and does one thing: it stands between a contact form and the mailbox behind it, holds the messages a machine wrote, and sends the rest to whoever should answer them. There is no second product and no plan for one.
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About
What Humainbox does
Humainbox is a single-purpose spam filter for contact forms, started in 2026. It sits between a website's form and the inbox behind it, reads every submission, holds the ones a machine wrote, and delivers the rest to the person who should answer them, with the sender's real reply address already resolved.
It was built for businesses whose work arrives through a form: agencies fielding enquiries for their clients, growing teams routing each message to the right desk, and trades quoting for jobs. Every decision is explained and reversible, nothing is deleted, you decide how strict each inbox is, and if the service is ever unavailable, mail is forwarded rather than held. It does one thing, and there is no second product.
Why the old defences stopped working is a longer argument, and it is written up separately.
What it is built on
Four promises
Anything standing between a business and its enquiries has to be accountable for the ones it gets wrong. These are the rules we build against, and each of them costs us something.
01
Nothing is deleted because we judged it
A message we stop is still there. It is just not in your mailbox. You can read anything, release anything, and see the full original of a message we judged wrongly. Content goes only when your retention window runs out, never because of a verdict, and never sooner for held mail than for delivered.
02
You set the threshold, not us
Loose, balanced or strict, chosen per inbox. We cannot know what a missed enquiry costs you, or what an extra one read costs your team. Those numbers are different for a careers form and a sales desk, so the line belongs to you.
03
Every decision is explainable
Each message shows the signals that fired and what each one weighed. A verdict you cannot inspect is a verdict you cannot argue with, and you should be able to argue with ours.
04
If we fail, mail still gets through
If Humainbox stops working, everything is passed straight through to you. If our system is unavailable, messages are forwarded rather than held. An outage should degrade us to a plain forwarder, never to a business quietly losing leads it never knew about.
Judge it on your own mail
Point one form at an inbox we generate and leave that inbox in dry run. Everything is delivered exactly as it is today, and you read the decisions we would have made about your own enquiries. If they are not the decisions you would have made, you will know inside a week.