Connect your account, then chat with AI to run tools.
Search inboxes, summarize threads, triage unread mail, send messages, and manage masked addresses from chat — connect your Fastmail account once.
Try this workflow
Inbox morning brief
Search my Fastmail inbox for unread messages from the last 24 hours and summarize what needs a reply today.
Opens MCPBundles Studio with this server selected. After sign-in, chat and run tools from the same thread.
Browse all toolsBuilt for
Operations Teams, Executive Assistants, Founders, Client Services Managers
Inbox morning brief
Daily triage without opening every thread manually.
Search my Fastmail inbox for unread messages from the last 24 hours and summarize what needs a reply today.
Thread catch-up
Long-thread recap for operators joining mid-conversation.
Pull the full Fastmail thread about the Riverside Dental contract and give me a bullet summary of what was decided and who owes a reply.
Send a follow-up
Send workflow grounded in the existing conversation.
Draft and send a Fastmail reply to the latest message in the Acme Dental onboarding thread — confirm next steps and ask for their preferred kickoff date.
Masked address for a signup
Privacy-forward signups without digging through settings.
Create a new Fastmail masked email address for a Harbor Legal software trial and tell me the address to paste at checkout.
What is Fastmail MCP?
It lets AI agents in Cursor, Claude, or ChatGPT work with your Fastmail mailbox — search and read mail, triage unread messages, send replies, and manage masked addresses — after you connect in MCPBundles.
Who is this for?
Operators and assistants who live in email and want inbox summaries, thread catch-ups, and send workflows from chat instead of copying subjects between tabs.
Can an agent delete my mail?
Agents can move, mark read, send, and manage drafts when you ask. Permanent deletion only happens when you explicitly request it.
Related editorial
Fastmail Email Workflows with AI
How AI agents search inboxes, summarize threads, send follow-ups, and create masked addresses without living inside the mail client.
Domain knowledge for Fastmail — workflow patterns, data models, and gotchas for your AI agent.
Fastmail uses JMAP for email. Mailboxes, search, fetch, triage, send, masked email, drafts.
Archive an email in Fastmail. This removes the message from the Inbox mailbox and adds it to the Archive mailbox (by mailbox role), while preserving a...
Mark multiple emails read/unread using one JMAP Email/set call by toggling the $seen keyword on each id. Use this to triage many messages quickly.
Move multiple emails into a mailbox using a single JMAP Email/set call. This REPLACES mailboxIds for each email with only the target mailbox id.
Create a draft email in Fastmail. This uploads an RFC822 message and imports it into the Drafts mailbox. Returns the created draft email id. Fetch by ...
Create a new Fastmail Masked Email address via MaskedEmail/set. Returns the created masked email object (including the generated email address).
Delete a Fastmail draft by destroying the underlying Email object via JMAP Email/set destroy. This permanently removes the draft.
Fetch an email by id via JMAP Email/get and return normalized fields (from/to/subject/dates + body_text). Use include_html=true when you need HTML; ot...
Fetch a thread by id via JMAP Thread/get. Returns thread metadata including the emailIds in the thread. Use get thread content to fetch normalized mes...
Get a short-lived download URL for a Fastmail attachment. The returned URL expires; call this tool again to generate a fresh URL if needed.
Fetch a Fastmail thread and return normalized content for each message (headers + body_text). This is the best tool for reviewing an entire conversati...
List email drafts in Fastmail (messages stored in the Drafts mailbox). Returns draft email ids; fetch by email id to read a draft body, or delete draf...
List attachments for an email. Returns attachment metadata including blob_id/name/type/size. Download a specific attachment to S3 for a presigned URL ...
List mailboxes (folders) in Fastmail via JMAP Mailbox/get. Results include id, name, role (e.g. inbox, trash), and other metadata. Use mailbox ids fro...
List Fastmail Masked Email addresses via the Fastmail JMAP masked email extension (MaskedEmail/get). Returns all masked emails (ids=null) with metadat...
Mark an email as read/unread in Fastmail via JMAP Email/set by toggling the $seen keyword. Use this for inbox triage.
Move an email to a target mailbox by setting mailboxIds via JMAP Email/set. This is the building block for archive/trash workflows (move to archive or...
Reply to an email in Fastmail using JMAP. Supports reply-all and HTML bodies. This preserves threading by setting inReplyTo and references.
Search Fastmail emails via JMAP Email/query. Returns matching email ids plus query metadata (queryState, total, canCalculateChanges). Fetch full messa...
Send an email from Fastmail using JMAP. Supports multiple recipients, CC/BCC, Reply-To, and HTML bodies. For replies in an existing conversation, use ...
Move an email to Trash in Fastmail by setting mailboxIds to the Trash mailbox (role=trash). Use this for delete workflows.
Update an existing Fastmail Masked Email via MaskedEmail/set. Supports changing state (enabled/disabled/deleted) and metadata fields (forDomain, descr...
Validate the Fastmail API token by fetching the JMAP session and checking capabilities. Returns 'ok' when mail + submission capabilities are present; ...
It lets AI agents in Cursor, Claude, or ChatGPT work with your Fastmail mailbox — search and read mail, triage unread messages, send replies, and manage masked addresses — after you connect in MCPBundles.
Operators and assistants who live in email and want inbox summaries, thread catch-ups, and send workflows from chat instead of copying subjects between tabs.
Agents can move, mark read, send, and manage drafts when you ask. Permanent deletion only happens when you explicitly request it.
Open the Fastmail skill page in MCPBundles, add your connection, and create an integration token in Fastmail Settings under Privacy & Security. Usage follows your Fastmail plan.
Add the MCPBundles server URL to your MCP client configuration (Claude Desktop, Cursor, VS Code, etc.). The URL format is: https://mcp.mcpbundles.com/bundle/fastmail. Authentication is handled automatically.
Fastmail provides 22 tools that can be called by AI agents, along with a SKILL.md that gives your AI agent domain knowledge about when and how to use them.
Fastmail uses API Key. Fastmail requires credentials. Connect via MCPBundles and authentication is handled automatically.
Connect Fastmail to any MCP client in minutes
https://mcp.mcpbundles.com/bundle/fastmailThe link prefills the Add custom connector dialog — you still review the values and click Add, then Connect to complete OAuth.
Fastmail and paste the MCP URL into Remote MCP server URL.Custom connectors at claude.ai require a paid Claude plan (Pro, Max, Team, or Enterprise).
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