Paris-based startup Upstream today announced the general availability launch of its AI-native inbox platform, alongside a $3 million pre-seed funding round backed by Y Combinator, Connect Ventures, and more than 30 founders and operators from companies including Framer, Algolia, Asana, Alan, and Webflow.
Following months in invite-only beta, Upstream is now publicly available, positioning itself as “the first inbox designed for humans and agents.”
The company has rebuilt email infrastructure from the ground up to support AI agents that can read, write, organise, and act on behalf of users, rather than layering assistants onto traditional email clients originally designed only for human interaction.
I spoke to Upstream CEO and co-founder Louis Lecat to learn more — and I gave it a try myself.
So much for the death of email
