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Lend your agent your email. Take it back any time.

Ask your AI agent what needs a reply.

Connect the email you already have. Your agent can then read, reply and tidy up whenever you ask.Connect your email, then ask your agent.

Create a free account
  • Free for 2 mailboxes, no card2 mailboxes free
  • Works with the agent app you use
  • Your password stays out of the chatPassword stays out of chat
  • Gmail, Outlook, iCloud and moreGmail, Outlook, iCloud
Your agent apppostkeep
  1. You: Connect my Gmail to postkeep.
  2. postkeep: Connecting your Gmail…
  3. Agent: Here's a one-time link. Type your Gmail app password there, so it stays out of our chat.Type your app password on this page, not here.
  4. Agent: Connected. I'll get an alert when new mail arrives.Connected. I'll hear about new mail.
  5. Alert: New mail · [email protected]Alert sent to your agent
  6. Then ask your agent
  7. You: What needs a reply today?
  8. Agent: Two need a reply: the school asks if you can come on Friday, and the electricity bill is due on Monday. Shall I draft the school reply?Two: the school, and the electricity bill. Draft a reply?
Example: connect your Gmail once, then ask your agent about your mail.Example: connect once, then ask.

Works with the agent apps you use and the mail you already haveWorks with your apps and your mail

Get your postkeep link

Agent apps

Mailboxes

01Getting started

Three steps, then ask your agent

You'll need one thing from your email provider: an app password, a separate password for apps like this one. Outlook skips this: you sign in with Microsoft.Three steps. Outlook needs only a sign-in.

  1. Create a free account

    Microsoft, Google, Apple or an email link. Free covers 2 mailboxes, no card.Sign in your way. No card.

  2. Add postkeep to your agent app

    In some apps, like Cursor, it's one click. In others, like Claude, you paste a link. Then the app asks you to sign in to postkeep.One click or a pasted link, then sign in.

  3. Ask your agent to connect your email

    Your agent sends you a one-time link. On that page you sign in, or type your app password, so it stays out of the chat.A one-time link keeps your password out of the chat.

Then ask your agent“What needs a reply today?”

Step 2 in the app you useStep 2 in your app

Pick your app to see the steps. Each one ends the same way: the app asks you to sign in to postkeep.Pick your app. Each ends with a sign-in.

One clickA real Cursor install link, with your postkeep link and nothing else.A real install link.

  1. Choose Add to Cursor. Cursor opens its install prompt.Choose Add to Cursor.
  2. Choose Install.
  3. Cursor opens postkeep's sign-in page. Sign in to postkeep and allow access.Sign in to postkeep.
Get your postkeep linkAll Cursor stepsAll steps

02What your agent can do

Everything your agent needs to handle mail.Everything your agent needs for mail.

Ask in your own words. Your Usage page shows what it did.Ask in your own words.

Find and read

Ask “What needs a reply today?” or “Find last month's electricity bill.”“What needs a reply today?”

Write and reply

Ask “Reply to the school and say we'll be there.” It sends from your own address.Replies from your own address.

Keep things tidy

Ask “Move the newsletters into a folder” or “Flag anything from the bank.” It can also delete mail.File, flag, clean up.

Hear about new mail

Your agent can get an alert when new mail arrives, so it can tell you about the ones that matter. Alerts go to a web address your agent setup can receive; see “How new-mail alerts work” below.Alerts for new mail, for setups that can receive them.

Every mailbox, one door

Gmail, Outlook, iCloud, Yahoo, Fastmail and other email providers. Outlook connects with a Microsoft sign-in; the others with an app password typed on a postkeep page.Gmail, Outlook, iCloud and more.

Your account

Ask “Connect my Outlook too” or “What plan am I on?”“What plan am I on?”

Tool names, for developers
Read
  • search_messages
  • get_message
  • list_folders
Send
  • send_message
  • reply_to_message
Organize
  • move_message
  • update_flags
  • delete_message
  • create_folder
Alerts
  • get_webhook_status
  • set_webhook_enabled
  • set_webhook_outbox_limits
Your account
  • get_account
  • connect_mailbox
  • get_connection_status
  • disconnect_mailbox
  • create_workspace
  • get_billing_link

The same tools as the open-source postkeep, plus account tools for Cloud.

You choose when your agent sends. In apps like Claude, ChatGPT, Cursor and VS Code, you can have it ask you before every email goes out.You choose: have your app ask before it sends.

Create a free account

03Control and privacy

You stay in charge

Your agent can only reach the inboxes you connect, and you can see what it did.Only the inboxes you choose.

GmailOutlookiCloudYour agent

  • Your password stays out of the chat

    You type it on a one-time postkeep page, so it stays between you and postkeep.Typed on our page, not in chat.

  • Delete your data yourself

    Delete your data in Settings and your mailbox logins are destroyed at once. The rest is deleted within 7 days, and backups expire within 30 days.Logins destroyed at once, the rest in 7 days.

  • Saved passwords are encrypted

    postkeep stores your app passwords and Microsoft sign-ins encrypted, with a separate key for each workspace.Stored encrypted, a key per workspace.

  • Your agent app signs in, like you do

    Your agent app signs in to postkeep the way you sign in to a website. You approve it once on a postkeep page.Apps sign in, like you do.

  • Take it back any time

    Disconnect an inbox and postkeep deletes its saved password or sign-in, its alert setup and its alert log right away, and frees its place on your plan. Remove an agent app in Settings and its access ends right away.Disconnect deletes its saved login right away.

  • You decide what gets sent

    Set your agent app to ask before it sends, and it waits for your OK. Every send is counted on your Usage page.Your app can ask you before each send.

Read the Privacy Policy

04Pricing

Start free

You pay for mailboxes, not messages. A mailbox is one email account, like [email protected]. Fair use applies.You pay per mailbox, not per message.

How many mailboxes?

3 mailboxes: Personal, $9 a month.3 mailboxes: Personal, $9/month

For a team: Business, $25 a month (5-mailbox minimum).Team: Business, $25/mo (min 5)

Example: 3 mailboxes on Personal3 mailboxes, Personal

Personal, 3 mailboxes
$9.00
Tax, if it applies
At checkout
Each month
$9.00 + tax

Paid to Creem, our merchant of record: the company that sells postkeep Cloud to you and handles tax. Cancel any time.Paid to Creem. Cancel any time.

Free

$0

Up to 2 mailboxes. No card.

Personal

$9/month

3 mailboxes, then $3 each.

Fits your count

Plus

$19/month

10 mailboxes, then $3 each.

Business

$5per mailbox /month

5 minimum ($25).

See pricingOr self-host as many as you run, free under MIT.Or self-host free (MIT).

05Usage

See what your agent did.

Counts only: how many, when, and whether it worked.Counts only.

  • What your agent asked postkeep to do, and anything that didn't work, with what to do next.What it did, and what didn't work.
  • Messages your agent opened and emails it sent, per mailbox.Opened and sent, per mailbox.
  • Every new-mail alert and whether it got through. Download it as a spreadsheet file (CSV).Every alert. Download as CSV.

Open the Usage page

Usage · last 7 daysExample data
Agent requests
1,299
73 didn't work
Messages opened
421
Opened by your agent
Emails sent
55
From your addresses
Alerts delivered
447 of 448
98.4% first try

Agent requests per day

  • Searches
  • Opens
  • Changes
  • Sends
  • Other
  • Didn't work

Use the left and right arrow keys to read each column.

  • Worked
  • Didn't work

Use the left and right arrow keys to read each column.

The Usage page with example data.

06Under the hood

How new-mail alerts work

When new mail arrives, postkeep calls a web address you choose (a webhook), so your agent hears about it without checking. Use an address your agent setup can receive.postkeep calls your alert address (a webhook) when new mail arrives.

  • A call to your alert address when new mail arrives, set per mailbox.A call per new message.
  • postkeep keeps a short log of alerts so it can retry them: 7 days, up to 1,000 per mailbox by default.A 7-day alert log, for retries.
  • An alert address that keeps failing is paused after 10 failures, and postkeep retries it every hour.Paused after 10 failures, retried hourly.
  • Your agent can turn alerts on and off for you.Your agent controls alerts.
  • See each delivery in the delivery log on your Usage page.Every delivery on your Usage page.
Docs
  1. New mail arrives[email protected]
  2. postkeep notices08:45 UTC
  3. Your alert address answers200 in 113 ms
Example alert. [TBD: final format to be published in the docs]
{
  "event": "new_mail",
  "mailbox": "[email protected]",
  "message_id": "msg_example_8f3a",
  "noticed_at": "2026-10-10T08:45:31Z"
}

07Open source

Free to run yourself.

postkeep is MIT-licensed. Cloud runs the same engine, so you can move between them.MIT. Cloud runs the same engine.

Self-host on postkeep.devView on GitHub
Self-hosting postkeep compared with postkeep Cloud
FeatureSelf-hostpostkeep Cloud
Enginepostkeep, MITThe same engine
Who runs itYou, on your machinesWe do, with updates
PriceFreeFree for 2 mailboxes, then from $9 a monthFree for 2, then $9+
Agent app setupYour own configOne click or a pasted link, then sign inAdd it and sign in
Mailbox passwordsOn your machineOne-time links, encrypted per workspaceEncrypted per workspace
Usage and alert logYour own logsThe Usage page

08Questions

Questions, answered.

More on postkeep.dev

What does postkeep keep?

Your account details, your mailbox logins (app passwords and Microsoft sign-ins), stored encrypted, and a short log of new-mail alerts so they can be retried: 7 days, up to 1,000 per mailbox by default. Disconnect a mailbox and its login and alert log are deleted right away. The Privacy Policy has the full list.

How do I connect Gmail?

With a Google app password: a 16-digit code Google makes for apps like this one. It needs 2-Step Verification. Many work or school accounts, accounts under Advanced Protection or with security keys only, and accounts where an admin has turned app passwords off can't make one. You type it on a postkeep page, so it stays out of the chat. Signing in to postkeep with Google doesn't connect Gmail.

Is signing in the same as connecting my Gmail?

They're separate. Signing in with Microsoft, Google, Apple or an email link gets you into postkeep. Your agent connects mailboxes through a one-time link, where you type the mailbox's app password or sign in with Microsoft.

What happens at my plan's limit?

Your agent tells you how many mailboxes you're using and sends you a link to add more. Connections you've started but not finished count too. Your bill stays the same unless you upgrade.

Who decides what my agent sends?

You do, in your agent app. Apps like Claude, ChatGPT, Cursor and VS Code can ask you before each email goes out; you choose this in the app's tool settings. postkeep sends what your agent asks it to, from your own address, and counts every send on your Usage page. What goes out is yours, like mail you send yourself.

Do I have to copy a password or code into my agent app?

Usually not. You add postkeep in one click (Cursor, VS Code) or by pasting your postkeep link (Claude, ChatGPT, Grok and others). Then the app asks you to sign in to postkeep. A few apps can't sign in. For those, you can make an access key in Settings: it works like a password for that one app.

Is postkeep open source?

The mail engine is open source under MIT, and Cloud runs that same engine, so you can move to self-hosting whenever you like. Accounts, billing and the other hosted parts are run by us. Engine fixes go back to the open-source project.

What if postkeep Cloud shuts down?

The mail engine is open source under MIT, and Cloud runs that same engine, so you can run it on your own machines whatever happens to Cloud.

Start free with two mailboxes.

No card. Add postkeep to your agent app, sign in, and connect your email.No card. Three steps.

Create a free account