I've been building voice AI agents for the past year, the kind that answer phone calls, book appointments, handle customer inquiries. It was going well until a client asked: "Can it also handle our email?"

Turns out, wiring an AI to a phone system is one thing. Wiring it to email is... a whole different mess. SMTP credentials, MIME parsing, threading headers (References, In-Reply-To), bounce handling, deliverability reputation. I spent two weeks on plumbing before my agent could read its first email.

That's when it hit me: every developer building AI agents is going to hit this exact wall. So I built AIThreads [1], the email infrastructure layer so you can skip the plumbing and get straight to the AI logic.

How it works:

Instant inboxes: Create support@yourorg.aithreads.io via API.

No DNS, no verification, just works. (unless you are adding your own domain)

Webhooks -> Email arrives → we POST parsed JSON to your endpoint → your agent decides what to do. Send via API -> Agent composes reply, calls our API, we deliver with proper threading so conversations stay grouped. Knowledge Base (RAG) -> Upload your docs, we embed them. Query for relevant context before generating replies. Smart escalation -> Sentiment analysis and priority detection built-in. AI knows when a frustrated customer needs a human. InBuilt Tools -> Pre-Built tools to manage the emails.

Try it now: Email hey@aithreads.io – our demo agent will reply.

https://aithreads.io