One API for the full email lifecycle. Create inboxes, send messages, receive replies, manage threads. A complete email backend you don't have to build.
What you can build
Create inboxes on demand
Each inbox is a real email address. Create one for every agent, every customer, or every workflow. No domain setup required for @inbox.ai addresses.
Send and receive email
Plain text, HTML, attachments, CC/BCC. Messages thread automatically using standard email headers. Replies land in the right conversation.
Search and filter
Find messages by sender, subject, or content. Filter by thread, direction, or label. Semantic search finds emails by meaning, not just keywords.
React to events in real time
WebSocket connections for instant notifications. Webhooks for serverless. Every event includes the full message and sender context.
Beyond sending and receiving
Drafts and scheduled send
Create drafts for human review before sending. Schedule messages for a specific time. Convert drafts to sent messages with one call.
Labels and organization
Tag messages with custom labels. Filter by label in queries. Track workflow state across conversations.
Custom domains
Send from your own domain with full email authentication. Dedicated IPs for high-volume senders.
Delivery metrics
Track sent, delivered, bounced, and complained rates per inbox. Identify deliverability issues before they affect your users.