WhatAn email middleware layer that lets recipients set pre-delivery conditions — sender whitelists, time windows, proof-of-work challenges, or deposit requirements — before messages reach their inbox.
SignalMultiple commenters expressed deep frustration that email recipients have almost no control over what reaches them before delivery, and one described building a DIY two-tier whitelist system with Proton's sieve filters to separate important personal email from everything else — suggesting strong latent demand for better recipient-side control.
Why NowThe explosion of AI agents sending email programmatically (as Cloudflare's new service enables) is about to dramatically increase email volume, making recipient-side filtering more urgent than ever before.
MarketKnowledge workers and professionals drowning in email; could start B2C at $5-10/mo then move to enterprise. Competitors are all post-delivery (spam filters, Hey's screening) — nobody does pre-delivery conditions at scale.
MoatNetwork effects — the more recipients using the system, the more senders are forced to comply with delivery conditions, creating a two-sided standard that becomes hard to route around.
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