> Revdoku vs Postmark inbound for AI agents: how incoming email reaches your code, attachments, storage, MCP, spam checks and sending.

# Revdoku vs Postmark for Inbound Email

Revdoku and Postmark can both receive email for your AI agent or app. Postmark is an email delivery service whose inbound feature turns each incoming email into a JSON webhook for your app. Revdoku gives each agent its own mailbox, keeps the email and its attachments as files and connects to AI apps through MCP.

## Short answer

**Choose Postmark** if you already run an app with a webhook endpoint, a database and a queue, and you also need a service to send transactional email.

**Choose Revdoku** if your agent needs its own mailbox with stored email and files, works from ChatGPT, Claude or a coding agent, and should get mail that is checked for malware and prompt injection first.

## Postmark inbound email vs a Revdoku mailbox

| | Revdoku | Postmark |
| --- | --- | --- |
| Address | One per mailbox, on Revdoku's domain or your own | A generated `@inbound.postmarkapp.com` address, or any address on your domain ([inbound docs](https://postmarkapp.com/developer/user-guide/inbound)) |
| How mail reaches your code | Signed webhook, WebSocket or polling; read the email through the API | The parsed email as a JSON webhook, retried for about 10 hours ([webhook docs](https://postmarkapp.com/developer/webhooks/inbound-webhook)) |
| Attachments | Saved as files in the mailbox | Base64 in the JSON, up to 35 MB in total |
| Where email is kept | In the mailbox, next to your agent's files | In your own app; you store what you need |
| AI apps (MCP) | Hosted MCP server with sign-in in the browser | Not stated for inbound email |
| Spam and malware | Malware scan and known spammers blocked; AI labels mark malicious prompts as `Junk` | SpamAssassin scores in headers; block senders, domains or a spam threshold |
| Sending | Replies to people who emailed the mailbox | Full sending service |
| Before you pay | Free to try, no card needed | Inbound is listed on the Pro and Platform plans ([pricing](https://postmarkapp.com/pricing)) |

## What you build around each one

With Postmark, your app owns the rest of the pipeline: it accepts the webhook, saves the email and attachments, queues a job and runs the agent. That is a good fit when those parts already exist.

With Revdoku, the mailbox already stores the email, attachments and results. An agent reads them through MCP, the CLI or the API and saves what it extracts next to the source. Your code still decides when to run the agent, for example from the webhook.

## When Postmark inbound fits better

- Your product already sends email through Postmark.
- You want the full email as JSON in one webhook call.
- You do not need a mailbox that people or AI apps open directly.

## 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_postmark) 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_postmark_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

### What is the difference between Revdoku and Postmark inbound?

Postmark turns each incoming email into a JSON webhook for an app you run, and your app stores and processes it. Revdoku gives each AI agent its own mailbox that keeps the email and attachments as files, with a hosted MCP server for AI apps.

### Does Postmark keep incoming email for my agent?

Postmark delivers the parsed email to your webhook, and your app stores what it needs. With Revdoku, the email and its attachments stay in the mailbox for later tasks and other agents.

### Can my agent send email with Revdoku?

A Revdoku agent replies to people who emailed its mailbox. It does not start new conversations, so if your app sends transactional email, a sending service such as Postmark is still the right tool for that part.

### Can I try Revdoku before I pay?

Revdoku is free to try with one mailbox and no card; while you try it, the mailbox replies only to the account owner. Postmark lists inbound processing on its Pro and Platform plans.

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