Control what reaches your agent.
Accept open mail, limit the inbox to existing threads, or allow verified senders and domains. Blocked mail stays inspectable in its own folder without firing a webhook or starting an agent run.
Mailbox for developers
Claim an inbox.ai or custom-domain address in one API call. Receive threaded mail, read quote-stripped replies, and answer from code.
Trusted by engineering and product teams
shipping at global scale.
From inbound mail to a threaded reply.
Provision a dedicated inbox for each agent, workflow, or customer conversation. Search threads, read messages, and send replies through Bird MCP, CLI, or SDKs.
Read the new reply.
Skip the quoted history.
Messages expose quote-stripped plain text and attachment metadata alongside the thread.
Reply in one call and keep the conversation together.
Retain conversation memory, expire raw source.
Raw MIME and original HTML bodies expire after 30 days. Keep headers, extracted text, and attachments for 30, 90, or 365 days so long-running threads stay searchable and ready for replies.
Explore Mailbox.
Provision addresses, filter inbound mail, and run two-way email conversations from code.
Mailbox API
Provision inboxes, list threads, and send replies over REST, SDKs, CLI, or MCP.
InboxesClaim an instant @inbox.ai address per agent or workflow, reserved to your workspace.
Custom domainsUse your own domain via MX records, or forward mail from Gmail and Microsoft 365.
ThreadsGroup inbound and outbound messages automatically with unread counts and last-sender direction.
RepliesReply to a message by ID and track delivery status directly on the thread.
AttachmentsInspect file names, MIME types, and sizes on the message, then fetch the files you need.
Receiving rulesSet an open, replies-only, or allowlist policy with per-sender and domain rules.
WebhooksWake your app on new inbox messages, new threads, and outbound delivery updates.
RetentionKeep extracted text, headers, and attachments for 30, 90, or 365 days while raw MIME expires at 30 days.
ComposeSend a fresh outbound email from the mailbox address and track replies in the new thread.
Scale without losing control.
Separate production and sandbox traffic into dedicated workspaces, scope API keys to the exact channels each service or agent needs, and track permission changes in the audit log.