Fastmail MCP

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by MadLlama25

Unofficial MCP server for the Fastmail JMAP API — email, contacts, and calendar tools for AI assistants. Not affiliated with Fastmail. Includes a DXT for Claude Desktop.

Install

$npx @anthropic-ai/dxt pack

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Tools (40)

add_labels

Add labels (mailboxes) to an email without removing existing ones

advanced_search

Powerful multi-criteria email filtering

advanced_search_metadata

Same filters as advancedsearch, metadata-only results (no body content)

archive_email

Archive an email — moves it and marks it read in one atomic step

bulk_add_labels

Add labels to multiple emails simultaneously

bulk_delete

Delete multiple emails (move to trash)

bulk_mark_read

Mark multiple emails as read/unread

bulk_move

Move multiple emails to a mailbox

bulk_pin

Pin or unpin multiple emails

bulk_remove_labels

Remove labels from multiple emails simultaneously

check_function_availability

Check what's available and get setup guidance

create_draft

Create an email draft (at least one of to/subject/body/attachments required; supports threading headers for reply drafts)

create_mailbox

Create a new mailbox (folder/label)

delete_email

Delete an email (move to trash)

download_attachment

Download an email attachment. If savePath is provided, saves the file to disk and returns the file path and size. Otherwise returns a download URL.

edit_draft

Edit an existing draft in place — only provided fields change; existing attachments are preserved

get_account_summary

Get overall account summary with statistics

get_email

Get a specific email by ID

get_email_attachments

Get list of attachments for an email

get_email_metadata

Get a specific email's metadata only (allowlisted headers, no body)

get_mailbox_by_name

Look up a mailbox by its full path from the root (e.g. Inbox/Receipts)

get_mailbox_stats

Get statistics for a mailbox (unread count, total emails, etc.)

get_recent_emails

Quick access to recent emails from any mailbox

get_thread

Get all emails in a conversation thread

get_thread_metadata

Get all emails in a thread, metadata only. Also accepts an email ID and resolves its parent thread.

list_emails

List emails from a specific mailbox or all mailboxes

list_emails_metadata

List emails from a mailbox, metadata only (headers, no body content)

list_mailboxes

Get all mailboxes in your account. On accounts with many mailboxes the full output can be large — pass properties for a slim view.

mark_email_read

Mark an email as read or unread

move_email

Move an email to a different mailbox (replaces all mailboxes)

pin_email

Pin or unpin an email

remove_labels

Remove specific labels (mailboxes) from an email

reply_email

Reply to an existing email with proper threading headers (automatically builds In-Reply-To and References). Set send=false to save as draft instead of sending.

save_attachment_to_webdav

Save an attachment directly to WebDAV cloud storage (Fastmail Files, Nextcloud, ...) without touching local disk

savePath

may be absolute or relative. Relative paths (including a bare filename) resolve against the download directory, so an attachment lands there in one step. Absolute paths must fall within that directory; traversal or symlink escape outside it is rejected. To save directly into your own location, set F

search_emails

Search emails by content

search_emails_metadata

Search emails by content, returning metadata only

send_draft

Send an existing draft

send_email

Full-featured email sending with proper draft/sent handling

test_bulk_operations

Safely test bulk operations with dry-run mode