> Revdoku vs Robotomail for AI agent email: receiving, sending, alerts, malware and prompt-injection checks, file storage and setup compared.

# Revdoku vs Robotomail

Looking for a Robotomail alternative? Revdoku and Robotomail both give AI agents their own email addresses, with an API, an MCP server and signed webhooks. They are built for different jobs. Robotomail is made for two-way email: on paid plans, an agent can email anyone first. Revdoku is made for receiving: any sender can reach the inbox on every plan, attachments are stored as files, and incoming mail is checked before your agent reads it.

## Short answer

**Choose Robotomail** if your agent must send the first email to people who have never written to it, such as sales follow-ups or outreach. It also fits if you want SDKs in Go, Ruby or Rust, or a Claude Code channel plugin.

**Choose Revdoku** if your agent mostly receives email: sign-up codes, invoices, documents, alerts and forwarded mail. Revdoku accepts mail from any sender, scans it for malware, labels prompt-injection attempts as `Junk`, and keeps files and an activity log next to the email.

## Email

| | Revdoku | Robotomail |
| --- | --- | --- |
| Receive email from anyone | Yes | Paid plans. The free plan accepts mail only from your verified address and discards the rest ([limits](https://robotomail.com/docs/concepts/limits)) |
| Reply to people who emailed the mailbox | Yes | Yes |
| Start new conversations with any address | No | Yes, on paid plans |
| Threads | Yes, with `conversation_id` | Yes |
| Alerts for new email | Signed webhook, WebSocket or polling | Signed webhooks or a server-sent events stream ([SDK docs](https://robotomail.com/docs/sdks)) |
| Custom email domains | Yes | Paid plans |
| Before you pay | Free to try, no card needed | Free plan: 1 mailbox, mail only between the agent and your verified address ([pricing](https://robotomail.com/pricing)) |

## Security checks on incoming email for AI agents

| | Revdoku | Robotomail |
| --- | --- | --- |
| Malware and virus scan | Every incoming email, automatically | Not provided. Its guide says not to treat a download as "a malware-scan verdict" ([security guide](https://robotomail.com/docs/guides/agent-email-security)) |
| Known spammers | Blocked automatically | Not stated |
| Prompt injection | An AI classifier labels malicious prompts as `Junk`, and the API withholds that email's content | Left to your code: the guide asks you to separate email from instructions and restrict tools |
| Access for each agent | Each connection gets Read only, Read & write or Full access for the mailboxes you pick | MCP sign-in asks for `mail:read` and `mail:send` |

More on how Revdoku protects mail and files is on the [security page](/security/).

## Files, team and data

| | Revdoku | Robotomail |
| --- | --- | --- |
| Attachments | Saved as files in the mailbox | Stored with the message, up to 25 MB per message |
| Store other files | Yes, next to the email, with locks and version history | Not stated |
| Activity log | Each read and change by people and agents | Not stated |
| Team members | Invite people with their own roles | Not stated |
| Data location | EU | Not stated |

## Setup

| | Revdoku | Robotomail |
| --- | --- | --- |
| Hosted MCP server | `https://mcp.revdoku.com`, sign-in in your browser | `https://robotomail.com/mcp`, OAuth ([MCP docs](https://robotomail.com/docs/mcp)) |
| Skill for coding agents | `npx skills add revdoku/revdoku --skill revdoku -g` | Claude Code email channel plugin ([GitHub](https://github.com/robotomail/claude-email)) |
| CLI | Revdoku CLI, bundled with the skill | `@robotomail/cli` on npm |
| REST API | `https://api.revdoku.com/v1`, with runnable JavaScript, TypeScript and Python examples | REST API with SDKs for TypeScript, Python, Go, Ruby and Rust, installed from GitHub |
| Setup prompt for chat apps | Copy one prompt into ChatGPT, Claude, Hermes or OpenClaw | Not stated |

## Robotomail or Revdoku: which fits your agent

| Your agent's job | Better fit |
| --- | --- |
| Sign up for websites and read confirmation codes | Revdoku |
| Collect invoices, quotes and other attachments | Revdoku |
| Answer people who write to it | Either |
| Several agents share one inbox and its files | Revdoku |
| Email leads or customers first | Robotomail |
| Run long two-way threads with new contacts | Robotomail |

## 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_robotomail) 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_robotomail). You get your first mailbox and its email address right away.
2. Connect your AI app. Pick it in the [list of AI apps](/connect/).
3. Send an email with an attachment to your mailbox address. Ask your agent to read it.

For other options, see [Revdoku vs AgentMail](/compare/agentmail/) and [Gmail vs Revdoku for AI agents](/compare/gmail-api/).

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

### What is the main difference between Revdoku and Robotomail?

Robotomail is built for two-way email, so on paid plans an agent can email anyone first. Revdoku is built for receiving email and attachments from anyone, with malware scanning, prompt-injection labels, file storage and an activity log. A Revdoku agent replies to people who wrote to it.

### Is Revdoku a good Robotomail alternative?

Yes, if your agent mainly receives email, such as sign-up codes, invoices, documents or alerts. If your agent must start conversations with new contacts, such as sales follow-ups, Robotomail fits that job better.

### Can the Robotomail free plan receive email from anyone?

No. Robotomail's free plan exchanges mail only between your agent and your verified email address, and other inbound mail is discarded. Revdoku accepts mail from any sender, also while you try it free.

### Does Robotomail scan email for malware?

Robotomail's own security guide says not to treat a download as a malware-scan verdict and to add scanning yourself if you need it. Revdoku scans every incoming email for malware and viruses and blocks known spammers automatically.

### Do both work with Claude and ChatGPT?

Yes. Both offer a hosted MCP server with browser sign-in. Revdoku's is at `https://mcp.revdoku.com`, and Robotomail's is at `https://robotomail.com/mcp`.

### Can my agent reply to emails with Revdoku?

Yes. A Revdoku agent can reply to people who emailed its mailbox, from the mailbox's own address and in the same thread. It needs read & write access to that mailbox. While you try Revdoku free, the mailbox replies only to the account owner.

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