Fastmail Archive Email
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 any other mailbox membership.
Fastmail Batch Mark Read Unread
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.
Fastmail Batch Move Emails
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.
Fastmail Create Draft
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 email id to read the body or delete the draft when done.
Fastmail Create Masked Email
Create a new Fastmail Masked Email address via MaskedEmail/set. Returns the created masked email object (including the generated email address).
Fastmail Delete Draft
Delete a Fastmail draft by destroying the underlying Email object via JMAP Email/set destroy. This permanently removes the draft.
Fastmail Fetch Email
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; otherwise returns plain text best-effort.
Fastmail Fetch Thread
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 message bodies for the whole thread.
Fastmail Get Attachment Download URL
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.
Fastmail Get Thread Content
Fetch a Fastmail thread and return normalized content for each message (headers + body_text). This is the best tool for reviewing an entire conversation at once.
Fastmail List Drafts
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 drafts by id when finished.
Fastmail List Email Attachments
List attachments for an email. Returns attachment metadata including blob_id/name/type/size. Download a specific attachment to S3 for a presigned URL when you need the file bytes.
Fastmail List Mailboxes
List mailboxes (folders) in Fastmail via JMAP Mailbox/get. Results include id, name, role (e.g. inbox, trash), and other metadata. Use mailbox ids from this tool when searching mail or moving messages between folders.
Fastmail List Masked Emails
List Fastmail Masked Email addresses via the Fastmail JMAP masked email extension (MaskedEmail/get). Returns all masked emails (ids=null) with metadata like state, forDomain, description, createdAt, and lastMessageAt.
Fastmail Mark Read Unread
Mark an email as read/unread in Fastmail via JMAP Email/set by toggling the $seen keyword. Use this for inbox triage.
Fastmail Move Email
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 trash mailbox).
Fastmail Reply Email
Reply to an email in Fastmail using JMAP. Supports reply-all and HTML bodies. This preserves threading by setting inReplyTo and references.
Fastmail Search Emails
Search Fastmail emails via JMAP Email/query. Returns matching email ids plus query metadata (queryState, total, canCalculateChanges). Fetch full message content using returned email ids.
Fastmail Send Email
Send an email from Fastmail using JMAP. Supports multiple recipients, CC/BCC, Reply-To, and HTML bodies. For replies in an existing conversation, use reply email instead of a new message.
Fastmail Trash Email
Move an email to Trash in Fastmail by setting mailboxIds to the Trash mailbox (role=trash). Use this for delete workflows.
Fastmail Update Masked Email
Update an existing Fastmail Masked Email via MaskedEmail/set. Supports changing state (enabled/disabled/deleted) and metadata fields (forDomain, description, url).
Fastmail Validate Token
Validate the Fastmail API token by fetching the JMAP session and checking capabilities. Returns 'ok' when mail + submission capabilities are present; otherwise returns missing capabilities.
