How to give Claude Code an email address on your domain

Checked November 9, 2026

To give Claude Code an email address, connect it to an email MCP server that hosts a real mailbox on your domain, then ask it to set up an address like agent@yourdomain.com. With Plainmail that is one claude mcp add command; Claude Code then writes the DNS records, creates the mailbox, and can read, send and reply to mail, while you read the same inbox in any mail app.

Step by step with Plainmail

Create a Plainmail account. Adding and verifying a domain is free; mailboxes need the $5 a month plan.

Add the MCP server to Claude Code:

claude mcp add --transport http plainmail https://app.plainmail.dev/api/mcp/mcp

Run /mcp, pick plainmail and sign in in the browser. Choose what Claude Code may do: read mail, send and organize mail, or manage domains and mailboxes.
Ask: Set up agent@yourdomain.com on Plainmail. Claude Code adds the domain and writes the MX, SPF, DKIM and DMARC records on Cloudflare, Vercel or Porkbun. On other DNS hosts it gives you the exact records to paste.
When the DNS checks pass, it creates the mailbox. You get a link that shows the password once, for your own mail app.

Running Claude Code where it can't open a browser? Create an API key in Settings and add it as a header: --header "Authorization: Bearer <key>". Full details are in the docs.

What Claude Code can do with the address

Read new mail and summarize it: What came into agent@yourdomain.com today?
Send and reply from the address, signed with DKIM for your domain.
Flag, mark read and move messages, and download attachments.
Add aliases like support@ or billing@ that deliver to the same mailbox, and set the sender name.
Check a domain's DNS and say what's missing.

Your options compared

	Email MCP server on your domain (Plainmail)	Agent inbox API (AgentMail)	Your own Gmail or Workspace	Sending API (Resend, Postmark, SES)
Address on your domain	Yes, up to 50 domains	Yes, 1 free, 10 on Developer	Yes, on Workspace	Sending only
Can receive and read mail	Yes	Yes	Yes	Not a mailbox
Works in Claude Code with no code	Yes, remote MCP with OAuth	Yes, MCP server	Through a Gmail connector or MCP server	You write the code
You read it in a normal mail app	Yes, IMAP/SMTP and web inbox	IMAP/SMTP with an API key	Yes	No
DNS written for you	Cloudflare, Vercel, Porkbun	Not listed on its pricing page	Guided; you add the records	You add records
Price	$5 a month flat	Free for 3 inboxes; $20 a month for 10	$7 to $8.40 per user a month	By sending volume

AgentMail and Workspace prices are from their own pricing pages, checked November 8, 2026. Details: Plainmail vs AgentMail, Plainmail vs Google Workspace.

When another option is better

Your product creates inboxes for its own users or agents through an API: AgentMail is built for that, and starts free.
You only need to send app mail from code, like receipts and password resets: a sending API such as Resend, Postmark or Amazon SES.
You want Claude Code to work in the inbox you already have, and your team lives in Docs and Drive: a Gmail or Workspace connector.
The agent needs to send more than 200 messages a day from one mailbox, or send bulk or cold mail: Plainmail doesn't allow that.

Keeping it safe

Email is untrusted input: a message can contain text that tries to give the agent orders. Plainmail labels email content as untrusted in every tool result and tells the agent never to follow instructions found inside an email. You choose the permissions when you connect, sending is capped at 200 messages per mailbox a day, and you can revoke access in Settings at any time.

Questions

Can Claude Code send email from my own domain?

Yes. Connect an email MCP server that hosts a mailbox on your domain. With Plainmail, Claude Code sends from that address through Amazon SES, signed with DKIM for your domain, so it passes SPF, DKIM and DMARC checks.

Does the agent need its own domain?

No. You can add agent@yourdomain.com next to your own address on the domain you already use, or put the agent on a spare domain to keep its mail apart.

Can I read the agent's mail myself?

Yes. Plainmail mailboxes are normal IMAP/SMTP accounts, so you can open the same inbox in Apple Mail, the Gmail app, Outlook or the web inbox and see everything the agent sent and received.

Does Claude Code ever see the mailbox password?

No. The agent signs in with OAuth or an API key. A new mailbox comes with a link that shows its password once, to you.

What does it cost?

Adding and verifying a domain is free. Mailboxes need the $5 a month plan, which covers up to 50 domains and 100 mailboxes.

Get started$5 a month for up to 50 domains and 100 mailboxes