Resend Inboxes
Claim this toolGive AI agents API-accessible inboxes to send, receive, and manage email threads
From $20/mo, billed monthly (free plan available)Freemium Email
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Tracked since 2026
The Bottom Line
- Price
- From $20/mo, billed monthly (free plan available). Compare plans
Key facts
- Resend Inboxes are email inboxes built for AI agents, with API access, thread support, and agent access.
- Every plan includes 3 inboxes free; additional inboxes cost a small monthly fee per inbox on paid plans.
- Emails sent or received through an inbox count toward the transactional email quota, with no separate inbox email allowance.
Pros
- Free tier includes 3 inboxes, making it easy to start
- API-first design ideal for AI agents and automation
- Simple per-inbox pricing with pay-as-you-go options
Cons
- Inbox emails consume the same transactional quota as API-sent emails, so high inbox volume can quickly use up allowances
- Additional inboxes require a paid plan and pay-as-you-go enabled
What is Resend Inboxes?
Resend Inboxes provides email inboxes designed specifically for AI agents, enabling them to send, receive, and manage email conversations programmatically. Each inbox is fully API-accessible, with support for email threads and agent access, making it easy to integrate email workflows into autonomous agents and automated systems. The product is built on Resend's email infrastructure, which includes RESTful APIs, SMTP relay, and official SDKs for multiple programming languages.
Every Resend plan, including the free tier, includes 3 inboxes. Additional inboxes can be added on paid plans for a low monthly fee per inbox. Emails sent or received through an inbox count towards the plan's transactional email quota, so there is no separate email allowance. This pricing model is designed to be simple and scalable, fitting both small projects and high-volume enterprise use cases.
Key Features
- 3 inboxes included on all plans
- Additional inboxes available for $1 per inbox per month on paid plans
- Email thread support for managing conversations
- Agent access for programmatic email handling
- RESTful API, SMTP relay, and official SDKs
- Inbound email processing with per-email counting
- Integration with Resend's transactional email quota
Pricing Plans
| Plan | Price | Details |
|---|---|---|
| Free | $0 / mo |
+3 more Show less
|
| Pro | $20 / mo |
+13 more Show less
|
| Scale | $60 / mo |
+19 more Show less
|
| Enterprise | Custom |
+19 more Show less
|
Included in all plans
- RESTful API
- SMTP relay
- Official SDKs
- Pristine shared IPs
- Automatic suppression list
- Bounce details
- DKIM, SPF, DMARC authentication
- All webhook events
- Social login
- GDPR compliance
- SOC 2 Type II certification
- Penetration testing
- DDoS protection
- Automated backups
- Multi-factor authentication
- API key permissions
- Ticket support
- In-app documentation
- AI assistant
Is Resend Inboxes worth the price?
Good value
The pricing is fair and generous for AI agent email use cases.
The Free tier offers a solid starting point with 100 daily limit and 3 inboxes. Pro at $20/month removes daily limits and adds useful features like tracking and Slack support, while Scale at $60/month scales domains and AI credits significantly.
Best for developers building AI agents who need reliable, programmable email infrastructure with built-in AI assistance.
Hidden Costs & Gotchas
Additional inboxes cost $1/inbox beyond 3
Dedicated IPs require add-on payment
Single Sign-On is add-on on Scale tier
Additional domains require add-on on Scale tier
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Resend Inboxes FAQ
How does Resend Inboxes help AI agents manage email workflows?
Resend Inboxes provides API-accessible inboxes that allow AI agents to send, receive, and manage email threads programmatically. This enables automated systems to handle email communications without manual intervention. Each inbox is built on Resend's email infrastructure with RESTful APIs and SMTP relay.
What kind of trade-offs should users consider when using Resend Inboxes for high-volume email tasks?
Inbox emails consume the same transactional email quota as API-sent emails, so high inbox volume can quickly use up allowances. Additional inboxes require a paid plan with pay-as-you-go enabled. This model works best when email activity is aligned with overall transactional volume.
Which teams benefit most from using Resend Inboxes?
Development teams building AI agents or automated systems benefit most from Resend Inboxes. The product offers RESTful APIs, SMTP relay, and official SDKs for multiple programming languages, making integration straightforward. Its API-first design fits projects that need programmatic email management.
How is Resend Inboxes priced?
Resend Inboxes is available on a free tier that includes 3 inboxes. Paid plans charge a low monthly fee per additional inbox, and emails sent or received through inboxes count toward the plan's transactional email quota. This pricing model is simple and scalable for both small projects and enterprise use cases.
Does Resend Inboxes provide APIs and SDKs for integration?
Yes, Resend Inboxes offers RESTful APIs, SMTP relay, and official SDKs for multiple programming languages. These tools allow developers to programmatically send, receive, and manage email threads within AI agent systems. The integration is designed to be straightforward and reliable.
How does Resend Inboxes handle email sending and receiving for autonomous agents?
Each inbox is fully API-accessible and supports email threads, so autonomous agents can send and receive emails programmatically. The system uses Resend's email infrastructure for reliable delivery. Agent access features make it easy to manage conversations within automated workflows.
Why would a developer choose Resend Inboxes for an AI agent project?
Resend Inboxes is designed specifically for AI agents, providing API-accessible inboxes with thread support and agent access. Its free tier includes 3 inboxes, making it easy to start without upfront costs. The per-inbox pricing and pay-as-you-go model scale with project needs.
What kind of email quota do Resend Inboxes use?
Emails sent or received through an inbox count toward the plan's transactional email quota. There is no separate email allowance for inboxes, so high volume can affect overall quota usage. This unified quota simplifies billing and resource planning.
Source: resend.com