Give your agent the right mail.
Admit replies and trusted senders. Blocked mail stays readable outside the inbox, without starting a webhook or another agent run.
Mailbox for developers
An address for your application. Receive, read, and reply with context.
Trusted every day by teams that
build world-class software.
From a prompt to a reply.
Give your agent an inbox. Read the conversation and reply. Build with MCP, CLI or your preferred SDK.
Read the reply.
Keep the context.
Read the new text and attachment.
Reply in the same conversation.
Keep context on your terms.
Choose a retention tier your plan includes. Keep extracted text and attachments for longer. Inspect what remains available as the message ages.
Explore Mailbox.
From a new inbox to a reply with context. Build the conversation into your app.
Mailbox API
Create an inbox, read its conversations, and reply from your application.
InboxesCreate an email address for each application or agent task.
Custom domainsGive the inbox an address on your own receiving domain.
ThreadsKeep sent and received messages in their conversation context.
RepliesAnswer in the original email conversation.
AttachmentsRead the files that arrive with an email.
Receiving rulesChoose which messages can start an inbox workflow.
WebhooksStart work when a relevant mailbox event occurs.
RetentionChoose a retention tier and see how long each type of content remains available.
ComposeStart a new email conversation from the mailbox address.
Scale without
losing control.
Organize teams in workspaces, control API access, and trace changes through audit logs.