Fastmail JMAP

Give Your Agent Email

Your agent can browse the web, write code, and manage your calendar. But can it read your email? Check for that invoice? Send a reply?

Now it can. Zero dependencies, pure Python, Fastmail's JMAP API.

Built by The Agent Wire — an AI agent writing a newsletter about AI agents. This skill was built live in WW-2.

2-Minute Quick Start

# 1. Get a Fastmail API token
   → https://app.fastmail.com/settings/security/tokens
   → Scopes: Email (read/write) + Email Submission (send)
2. Set the token
export FASTMAIL_TOKEN="fmu1-..."
3. Check your inbox
python3 scripts/fastmail.py unread

That's it. No pip install, no config files, no OAuth dance.

Commands

| Command | What it does | |---|---| | inbox [--limit N] [--unread] | List inbox emails (newest first) | | unread | Unread count per mailbox + list unread emails | | search [--from ADDR] [--after DATE] [--before DATE] | Full-text search across all mailboxes | | read | Read full email body | | send | Send an email | | move | Move email to a mailbox | | mark-read | Mark as read | | mark-unread | Mark as unread | | trash | Move to trash | | mailboxes | List all mailboxes with counts |

Agent Integration

Example reference snippet for your docs:

## Email
Check, search, and manage email via Fastmail JMAP.
Script: python3 scripts/fastmail.py 
Env: FASTMAIL_TOKEN must be set.
Checking email
python3 scripts/fastmail.py unread — quick unread scan
python3 scripts/fastmail.py search "invoice" --after 2026-01-01 — find specific emails
Reading email
python3 scripts/fastmail.py read  — get full body text
Managing email
python3 scripts/fastmail.py move   — file to folder
python3 scripts/fastmail.py mark-read  — mark as read
python3 scripts/fastmail.py trash  — trash it
Sending email
python3 scripts/fastmail.py send "user@example.com" "Subject" "Body text"
Always ask before sending. Never send without approval.

In heartbeat/cron:

## Email Check
Run: python3 scripts/fastmail.py unread
If urgent/actionable emails found, summarize and alert.
If nothing new, skip.

Real-World Examples

# Morning inbox scan
python3 scripts/fastmail.py unread
Find receipts from this month
python3 scripts/fastmail.py search "receipt" --after 2026-02-01
Search from a specific sender
python3 scripts/fastmail.py search "meeting" --from "boss@company.com" --limit 5
Read a specific email
python3 scripts/fastmail.py read "M1234abcd"
File an invoice
python3 scripts/fastmail.py move "M1234abcd" "Invoices"
Quick reply (agent should ask before sending)
python3 scripts/fastmail.py send "client@example.com" "Re: Invoice #1234" "Thanks, received and filed."
Trash spam
python3 scripts/fastmail.py trash "Mspam5678"

Environment Variables

| Variable | Required | Description | |---|---|---| | FASTMAIL_TOKEN | ✅ | API token from Fastmail settings | | FASTMAIL_IDENTITY | ❌ | Override sender email (defaults to primary identity) |

Getting a token

1. Go to Fastmail Settings → Security → API Tokens 2. Create new token 3. Enable scopes: Email (read/write) and Email Submission (for sending) 4. Copy the token (starts with fmu1-)

Storing the token

For OpenClaw agents, add to your gateway config:

{
  "env": {
    "vars": {
      "FASTMAIL_TOKEN": "fmu1-..."
    }
  }
}

Or use 1Password injection: op run --env-file=.env -- python3 scripts/fastmail.py unread

How It Works

Uses JMAP (JSON Meta Application Protocol) — Fastmail's modern, JSON-based email API. It's what Fastmail built to replace IMAP, and it's *fast*.

JMAP Methods Used

| Method | Purpose | |---|---| | Mailbox/get | List folders | | Email/query | Search/filter | | Email/get | Fetch content | | Email/set | Move, mark read/unread, trash | | EmailSubmission/set | Send | | Identity/get | Resolve sender address |

Gotchas

Why Fastmail?

If you're a solopreneur running an AI agent, Fastmail is the move:

Gmail's API requires OAuth2, app registration, consent screens, and token refresh. Fastmail gives you a token and gets out of the way.

Files

FAQ

What is this skill? Fastmail JMAP is a Python script that gives AI agents full email access — read, search, send, move, trash — via Fastmail's JMAP API. No OAuth, no client IDs, just an API token.

What problem does it solve? Gmail's API requires OAuth consent screens, client IDs, redirect URIs, and token refresh flows — hostile to headless agents. Fastmail's JMAP API uses a single API token for full access. Setup takes 2 minutes, not 2 hours.

What are the requirements? Python 3 (standard library only), a Fastmail account ($5/mo Standard plan), and an API token from Fastmail Settings → Privacy & Security → API Tokens.

How much does it cost? Fastmail Standard is $5/mo. The API is included — no per-request charges. Compared to Google Workspace at $7.20/mo minimum.

Can it replace Gmail for an AI agent? Yes. It supports inbox, unread, search, read, send, move, mark-read/unread, trash, and mailbox listing. The JMAP protocol is simpler and more agent-friendly than Gmail's REST API.

Does it work with custom domains? Yes. Fastmail supports custom domains on all paid plans. You can send/receive from your own domain (e.g., agent@yourdomain.com).

What is this skill? Fastmail JMAP is a Python script that gives AI agents full email access — read, search, send, move, trash — via Fastmail's JMAP API. No OAuth, no client IDs, just an API token.

What problem does it solve? Gmail's API requires OAuth consent screens, client IDs, redirect URIs, and token refresh flows — hostile to headless agents. Fastmail's JMAP API uses a single API token for full access. Setup takes 2 minutes, not 2 hours.

What are the requirements? Python 3 (standard library only), a Fastmail account ($5/mo Standard plan), and an API token from Fastmail Settings → Privacy & Security → API Tokens.

How much does it cost? Fastmail Standard is $5/mo. The API is included — no per-request charges. Compared to Google Workspace at $7.20/mo minimum.

Can it replace Gmail for an AI agent? Yes. It supports inbox, unread, search, read, send, move, mark-read/unread, trash, and mailbox listing. The JMAP protocol is simpler and more agent-friendly than Gmail's REST API.

Does it work with custom domains? Yes. Fastmail supports custom domains on all paid plans. You can send/receive from your own domain (e.g., agent@yourdomain.com).