Programmatic inbox creation
Create an inbox at an address on one of your verified domains through the API, with optional forwarding when you do not want to add an MX record.
Resend Inboxes
Resend Inboxes provides shared, domain-based inboxes for teams that need to receive, organize, and reply to email. Developers can create inboxes through the API, connect agents through MCP or skills, and build workflows around shared conversations.
Resend Inboxes overview
Resend Inboxes is a shared inbox and email workflow product for teams building on Resend. It provides domain-based addresses for sending and receiving email, a collaborative inbox experience, and an Inbox API for working with conversations and threads from applications or automated workflows.
The product is designed to connect human teams with software agents. Teams can share an inbox, assign conversations, and continue an existing thread, while agents connected through MCP or skills can access messages and email tools for routine handling. Inbox creation and operation are API-driven, making the product relevant to developers building support, recruiting, operations, or other email workflows.
Key features
Conversation and thread access
List conversations as they arrive, then retrieve individual threads and the emails they contain through the Inbox API.
Thread replies
Send replies on existing threads from your application, an agent, or an automated workflow.
Agent connections
Connect agents through MCP or skills so they can access conversations, messages, and email tools for routine work.
Team collaboration
Share inboxes with teammates, assign conversations, and resume work across people instead of keeping email in individual accounts.
Bidirectional email handling
Use inboxes for both sending and receiving email at a domain address, while keeping inbox traffic within the transactional email quota.
Use cases
Customer support coordination
Create a domain-based support address, let teammates share the queue, and assign or hand off conversations as customer issues move between people.
Recruiting and hiring workflows
Use an inbox to collect applications and let recruiting or hiring teams review, assign, and continue candidate conversations from a shared workspace.
Agent-assisted email operations
Connect an agent to read incoming messages, identify routine requests, and draft replies for team review or handle defined email tasks through an automated workflow.
Engineering and operations triage
Receive operational notices such as webhook failures, DNS issues, or deliverability concerns in a team-accessible inbox where the relevant people can pick up the thread.
Application-integrated messaging
Use the API to create inboxes for an application, retrieve conversations and messages, and reply to existing threads without building the underlying email-receiving flow from scratch.
Pros and Cons
Pros
- Supports shared team access, conversation assignment, and handoffs between teammates.
- Provides API operations for creating inboxes, listing conversations, retrieving threads, and replying.
- Can connect agents through MCP or skills to work with conversations and email tools.
- Supports both receiving and sending email at a domain-based inbox address.
- Every Resend plan includes three inboxes, with additional inboxes available on paid plans using pay-as-you-go billing.
Cons
- The available source material does not document the full set of assignment, triage, automation, or message-management controls beyond the examples shown.
- Inbox email is counted against the transactional email quota, so inbox usage shares capacity with other transactional email activity.
- Creating an inbox depends on domain verification and receiving configuration, unless the forwarding option is used.
FAQ
How do I create an inbox?
You can create an inbox through the Inbox API. It receives and sends email at an address on one of your verified domains, such as [email protected]. Without forwarding, the domain must have receiving enabled, with DKIM, SPF, and an inbound MX record verified or pending. With forwarding enabled, only DKIM and SPF verification are required.
Can I connect an AI agent to an inbox?
Yes. Resend describes agent connections through MCP or skills. Connected agents can access conversations, messages, and the tools needed to work with email, including drafting replies and handling routine email workflows.
Can multiple teammates use the same inbox?
Yes. The product supports shared inboxes for team collaboration. Teams can share inboxes, assign conversations, and continue work where another teammate left off.
What can the Inbox API do?
The Inbox API supports listing conversations, fetching a thread and its emails, and sending a reply on an existing thread from an application, agent, or automated workflow.
How are inboxes priced?
Every Resend plan includes three inboxes. On paid plans with pay-as-you-go enabled, additional inboxes cost $1 per inbox per month. Emails sent or received through an inbox count toward the plan's transactional email quota.
Quick Facts
- Category
- Shared inbox and email workflow tool
- Platform
- Web interface and Inbox API
- Primary users
- Developers, teams, and connected email agents
- Core workflow
- Create inboxes, receive email, collaborate on threads, and send replies
- Included inboxes
- Three per Resend plan
- Email accounting
- Inbox emails count toward the transactional email quota