> Revdoku vs Resend receiving for AI agents: addresses, webhooks, attachments, retention, MCP, spam checks and sending compared.

# Revdoku vs Resend for Incoming Email

Resend is an email API for developers that can now receive email too, with inbound email for your domain. Each incoming email triggers a webhook, and your app fetches the content through the API. Revdoku gives each AI agent its own mailbox, keeps email and attachments as files and connects to AI apps through MCP.

## Short answer

**Choose Resend** if your app already sends through Resend and you want receiving in the same account, or if you need to send new emails as well as receive them.

**Choose Revdoku** if your agent needs a mailbox that keeps its email and files, checks incoming mail for malware and prompt injection, and lets several agents share the same mailbox with their own access.

## Resend inbound email vs a Revdoku mailbox

| | Revdoku | Resend |
| --- | --- | --- |
| Address | One per mailbox, on Revdoku's domain or your own | Any address on a free `resend.app` subdomain, or your own domain ([receiving docs](https://resend.com/docs/dashboard/receiving/introduction)) |
| How mail reaches your code | Signed webhook, WebSocket or polling | `email.received` webhook with IDs only; fetch the content through the API |
| Attachments | Saved as files in the mailbox | Download links valid for 1 hour ([attachments](https://resend.com/docs/dashboard/receiving/attachments)) |
| How long email is kept | In the mailbox until you delete it | 30 days of data retention on the Free, Pro and Scale plans ([pricing](https://resend.com/pricing)) |
| AI apps (MCP) | Hosted MCP server with sign-in in the browser | Hosted MCP server that can list and read received email ([MCP docs](https://resend.com/docs/mcp-server)) |
| Spam and malware | Malware scan and known spammers blocked; AI labels mark malicious prompts as `Junk` | Not stated for received email |
| Sending | Replies to people who emailed the mailbox | Full sending service, including replies in a thread |
| Before you pay | Free to try, no card needed | Free plan: 3,000 emails a month, received email included |

Resend also has an Inboxes product for agents in private beta ([Resend Inboxes](https://resend.com/products/inboxes)).

## When Resend fits better

- You already send email through Resend.
- Your agent must email new people, not only reply.
- Your app copies what it needs into its own storage within the retention period.

## When Revdoku fits better

- Email and attachments must stay available for later tasks and other agents.
- Agents connect from ChatGPT, Claude, Codex or Claude Code without your own backend.
- You want each email checked and labeled before an agent reads it.

## Try Revdoku

1. [Create a mailbox](https://app.revdoku.com/users/sign_up?plan=PLAN-ENTRY-MONTHLY&utm_source=revdoku.com&utm_medium=website&utm_campaign=compare_resend) from $4.99/mo, or [try it free](https://app.revdoku.com/users/sign_up?utm_source=revdoku.com&utm_medium=website&utm_campaign=compare_resend_free). Your first mailbox and its address are ready right away.
2. Connect your AI app from the [list of apps](/connect/), or call the [API](/api/).
3. Send an email with an attachment to the mailbox and ask your agent to read it.

More options are in [email services for AI agents compared](/compare/email-for-ai-agents/).

Email address
for your AI agent

youragent@yourdomain.com address
to receive emails, send replies
and store attachments and files.

Built-in virus, malware and spam filter

Built-in AI screening against prompt injection

Built-in secure file storage

Read, send, manage via API, MCP, CLI

Create mailbox
From $4.99/mo · 30-day money-back guarantee

or Try free : 1 mailbox, replies only to you, no card

## Frequently Asked Questions

### Can Resend receive email?

Yes. Resend receives email on a free resend.app subdomain or your own domain and sends an email.received webhook with IDs only. Your app then fetches the content and attachments through the API.

### How long does Resend keep received email?

Resend lists 30 days of data retention on its Free, Pro and Scale plans. A Revdoku mailbox keeps email and attachments until you delete them.

### Is Revdoku a Resend alternative for AI agents?

For agents that mainly receive email and documents, yes. Revdoku stores each email and attachment as files, checks incoming mail for malware and prompt injection, and connects to AI apps through a hosted MCP server.

### Can my agent send new emails with Revdoku?

No. A Revdoku agent replies to people who emailed its mailbox. If your agent must email new people, Resend's sending service fits that part better.

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[View the canonical page](https://revdoku.com/compare/resend/) · [Browse llms.txt](https://revdoku.com/llms.txt)