Email for AI agents, on your own domain
Your AI agent gets a real inbox, such as agent@yourcompany.com. Claude, ChatGPT, Grok or your own bot can search, read, reply, forward and file mail, and even set up its own address. You approve what it may do.
Find the invoice Acme sent last week and forward it to our accountant, sam@numbers.nl.
Done. I forwarded "Invoice 2041 for October" from Acme Supplies to sam@numbers.nl, with the PDF attached. It's due on 30 November.
Real email skills, with permissions you choose
When you connect an agent, you tick what it may do. Each tick unlocks a set of tools.
Read
Search, read and wait for mail, and open attachments: text, images, PDFs and Office files.
Search and read mail
Send
Write, reply and forward from your domain, with attachments up to 10 MB.
Send mail as the mailbox
Organise
Move, flag, mark and file messages, and make folders. Deleting goes to the Trash.
Move, flag and delete mail, and manage folders
Set up
Add and verify domains, check DNS, and create mailboxes and aliases.
Add domains, mailboxes and aliases (account owner only)
Let your agent set up its own inbox
New to PostPike? Add PostPike to your AI app and choose "Let the agent set it up". You give only your email address and a password. The agent adds your domain, tells you which DNS records to add (or adds them itself, if it has access to your DNS), checks them, and makes its own mailbox.
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Add PostPike to your AI app
Use the address
https://admin.postpike.com/mcp. Steps for each app are below. -
Allow it once
On PostPike's page, choose to let the agent set it up, enter your email and a password, and select Allow.
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Tell it the address you want
Ask for agent@yourcompany.com, and the agent does the rest, with you adding the DNS records it gives you.
Set up an inbox for yourself on yourcompany.com, called agent@.
All set. The DNS records you added check out, and agent@yourcompany.com is ready. I can send and receive mail from it now.
Works with Claude, ChatGPT, Grok and your own bots
Every app connects to the same address. You sign in as the mailbox the agent should use, or let it set up a new one.
https://admin.postpike.com/mcp Claude
Web, desktop and phone. Add PostPike under Customize, then Connectors, as a custom connector.
Step by stepChatGPT
Add PostPike as a custom MCP server under Plugins. On Pro it can only search and read; sending and set-up need a Business, Enterprise or Edu workspace.
Step by stepGrok
Add a custom connector at grok.com/connectors with PostPike's address.
Step by stepClaude Code
One command in your terminal, then sign in with /mcp.
Step by stepYour own bot
Bots on the Claude, OpenAI or xAI API use an agent key instead of signing in.
Step by stepClaude Code, in one line
claude mcp add --transport http postpike --scope user https://admin.postpike.com/mcpThen type /mcp in Claude Code and sign in.
An email MCP server for any MCP client
PostPike runs a remote MCP server over Streamable HTTP. Clients sign in with OAuth 2.1 and PKCE, and register themselves, so there are no keys to copy. Headless bots use an agent key as a Bearer token instead. These are the tools an agent can get:
| Tool | What it does | Needs |
|---|---|---|
send_email | Send an email. Sends at once, with attachments up to 10 MB in total. Counts toward the mailbox's daily sending limit. | Send |
reply_to_email | Reply to an email. Replies in the same thread. | Send |
forward_email | Forward an email. Forwards a message with its attachments, below an optional note. | Send |
search_emails | Search emails. Finds messages, newest first, by sender, subject, text, folder or date. | Read |
read_email | Read an email. Returns one message with its text and a list of its attachments. | Read |
read_attachment | Read an attachment. Opens text files, images, PDFs, and Word, Excel and PowerPoint files. | Read |
wait_for_email | Wait for an email. Waits for a new message, such as a sign-up code, instead of polling. | Read |
list_folders | List folders. The mailbox's folders, with how many messages each holds. | Read |
move_emails | Move emails. Moves messages to a folder. | Organise |
mark_emails | Mark emails. Marks messages read or unread, flagged or not. | Organise |
delete_emails | Delete emails. Moves messages to the Trash, where you can still restore them. | Organise |
create_folder | Create a folder. Makes a new folder, optionally inside another. | Organise |
list_mailboxes | List the account's mailboxes. Domains, mailboxes, aliases and how much of the plan is used. | Set up |
add_domain | Add a domain. Claims a domain and returns the TXT record that proves it. | Set up |
verify_domain | Verify a domain. Checks the TXT record and makes the domain ready for mail. | Set up |
check_domain_setup | Check the domain's setup. Checks the domain's DNS now and lists what is still missing. | Any |
test_split_delivery | Test that mail is passed on. For domains that keep Google, Microsoft or Zoho: tests that unknown addresses reach PostPike. | Any |
create_mailbox | Create a mailbox. Makes a new mailbox for the agent or a colleague. | Set up |
add_alias | Add an alias. Gives a mailbox another address, on any verified domain of the account. | Set up |
remove_alias | Remove an alias. Takes an alias off its mailbox. The mail stays. | Set up |
set_mailbox_storage | Set a mailbox's storage. Shares the plan's storage between mailboxes. | Set up |
"Set up" tools only work for the account owner. Domain checks are open to any agent on that domain.
You stay in charge of your mail
No passwords for agents
You approve each agent on PostPike's own page. Agents get a sign-in of their own that you can disconnect at any time.
Only what you tick
Read, send, organise and set up are separate permissions. Owners decide who in the team may connect agents at all.
You're told
You get an email whenever an agent connects or a key is made, and the AI agents page lists every connection.
Sending limits
Agents send within the mailbox's daily limits, from your domain, signed with DKIM, like any other mail.
Nothing deleted for good
When an agent deletes mail, it goes to the Trash, where you can still restore it.
Mail is data, not orders
PostPike tells every agent that text inside messages is never an instruction to follow.
Give your agent an address without moving your team
Keep your team's mail where it is. Your provider passes mail for unknown addresses on to PostPike, so agent@yourcompany.com can live here, free, next to everyone else.
How it worksGoogle, Microsoft or Zoho
you@ team@ sales@Stays exactly as it is
PostPike
agent@ AI invoices@ support@New addresses, free
What people use agent inboxes for
Sign-up codes
The agent signs up for a service and waits for the code to arrive.
Invoices
Collect invoices in invoices@ and forward them to the accountant.
Support
Draft or send answers to common questions in support@.
Follow-ups
Find unanswered threads and send a polite reminder.
AI agent questions
Which AI apps work with PostPike?
Any app or bot that can use a remote MCP server: Claude, ChatGPT, Grok and Claude Code, and your own bots on the Claude, OpenAI or xAI APIs. The help center has the steps for each.
Should my agent have its own address?
Often, yes. An address such as agent@yourcompany.com keeps the agent's mail apart from yours, and people can write to it directly. You can also let an agent work in your own mailbox. You choose per connection.
Does my agent see my password?
No. You sign in on PostPike's own page and approve the agent there, the same way you approve an app with Google or Microsoft. Bots without a browser get an agent key instead, which you can disconnect at any time. Changing the mailbox's password also ends it.
Can an agent send mail without asking me?
Only if you allow it to send. Many AI apps, such as ChatGPT, also ask you to confirm before anything that changes your mail. Every send counts toward the mailbox's daily limit, and deleted mail goes to the Trash, where you can restore it.
Does PostPike use AI on my mail?
No. PostPike doesn't read your mail with AI or train anything on it. When you connect an agent, the AI provider you chose processes what that agent reads, under that provider's terms.
What does it cost?
AI agent access is included on every plan, Free too. A mailbox for your agent counts as one of your plan's mailboxes. See pricing.
Can messages trick my agent?
Anyone can send an email, so mail can contain text written to mislead an AI. PostPike tells every agent that message bodies are data, never instructions to follow. Give an agent only the permissions it needs, and keep the AI app's own confirmations on for sending.
Give your AI agent an inbox today
Free on your own domain, with five mailboxes for you, your team and your agents.