Skip to content
Beta

Private beta, free while it lasts

Email for your agents, a little early.

Mailbay is in private beta. Tell us what you are building and we will send you an invite. We read every request and invite people in small batches.

What will you use Mailbay for?

We use your email for the beta only: a confirmation now and your invite later. No newsletter, no tracking.

Already invited? Sign in

What the beta includes

Inboxes that work before DNS
Every workspace gets a private mailbay.email address space with a Catch-all. Create an address and receive mail in seconds.
Wait for an email
One call blocks until the message arrives, with sign in codes and links already pulled out. Built for agents and end to end tests.
Sending and threads
Send and reply in threads from any inbox. Delivery statuses, suppressions and signed webhooks or a WebSocket for events.
Your own domains
Add a domain and we check every record live. On Vercel or Cloudflare, paste a token once and we write the records for you.
API, CLI and MCP
The same actions from a REST API, the mailbay CLI and an MCP server your agents connect to with an API key.

During the beta every workspace is on the Free plan: 3 inboxes, 3,000 emails a month and 3 custom domains. Paid plans start when billing launches, and nothing is charged before then.